Dell Pro Plus, SL525, UD2403 Manual
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Dell Pro Plus, SL525, UD2403 Manual

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Contents
Dell Pro Plus, SL525, UD2403 Manual

What's in the box


This page provides the list of components that are shipped with your speakerphone. If any component is missing, contact Dell. For more information, see Contacting Dell.
informationNOTE: Some items may be optional and may not ship with your speakerphone. Some features may not be available in certain countries.

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Using your Dell Pro Plus Wireless Speakerphone

There are three connections available for usage:

  • Wired USB
  • Bluetooth
  • Wireless Audio Receiver connection

Avoid using multiple connections to the same computer/host, as it may confuse when using multiple connections.

  1. Locate the USB Type-C cable at the bottom of your SL525. With the USB Type-C cable facing you, release the USB Type-C cable from the grooves on the speaker.
    Using your Dell Pro Plus Wireless Speakerphone - Step 1
  2. Connect the USB-C cable or USB-A adapter of your SL525 to the USB-C or USB-A on your computer.
    Using your Dell Pro Plus Wireless Speakerphone - Step 2

Turning on/off the speakerphone
Press and hold the power button for two seconds to turn on/off the speakerphone. You will hear power on/off voice prompt.
Turning on/off the speakerphone

Bluetooth connection
Press and hold the Bluetooth button for three seconds to start the pairing mode and you hear a Bluetooth pairing voice prompt with white LED blinks.
Bluetooth connection

Bluetooth Dell Pair connection
Dell Pair supports the following:

  • Detect Dell peripheral devices such as wireless speakerphone, wireless headset, mouse, and keyboard.
  • Seamlessly pair devices through Bluetooth.

Download and installation
Dell Pair is preinstalled on certain Dell computers. For more information about the list of Dell Pair compatible devices, see dell.com/support/kbdoc/000201693.
If the laptop model number is supported and Dell Pair is not available, then you can manually download and install the application.

  1. Go to dell.com/support.
  2. In the Search support box, enter the Service Tag of your computer and then click Search.
  3. In the Drivers & Downloads section, download the Dell Pair executable file.
  4. Follow the on-screen instructions to complete the installation. After the installation is complete, Dell Pair is available on Windows start menu.

Steps to pair through Dell Pair
Place your wireless speakerphone next to the computer, and press the Bluetooth pair button to activate the Dell pair application. Dell Pair notifies when a supported device is turned on. Click Pair to begin a Bluetooth pairing with the device.
Steps to pair through Dell Pair

Wireless Audio Receiver connection
Connect the USB Type-C wireless audio receiver to a USB-A adapter and connect the adapter to the computer or connect the wireless audio receiver directly to the computer.

  • Power LED: Lights up blue for 3 seconds and slowly blinks in blue when the speakerphone is successfully connected to the device.
  • USB-C Wireless Audio Receiver LED: Blinks blue when not connected and lights up blue when connected.
    Wireless Audio Receiver connection

Battery Status
The user can hear battery high/medium/low voice prompt when turning on the speakerphone. Battery high voice prompt will be indicated when battery level at 70%~100%, battery medium voice prompt will be indicated when battery level at 69%~10%, battery low voice prompt will be indicated when battery level under 10% and right before power off.

Battery steps Battery Level Turn on LED
Battery Low 1~10 A
Battery Medium 11~22 A to B
23~34 A to C
35~46 A to D
47~58 A to E
59~70 A to F
Battery High 71~85 A to G
Battery High 86~100 A to H


informationNOTE: During usage, when battery level become low at 10%, 3% and 2%, device will play voice prompt "Battery Low".
informationNOTE: Short press power button at any time to get the battery level voice prompt and LED indication.
Battery Status

Battery Life

Battery Life Hours Volume (%)
Talk time Up to 12hrs 50
Music time Up to 9hrs 50
Power Save Speaker turns into power save mode after 30 minutes of inactivity
Power Off Speaker turns into power off mode after 4 hrs of inactivity

informationNOTE: The Talk/Music time is based on a specific audio file of an un-muted state.

Status indication

SL525 is a speakerphone which can be used for communication once it is connected to a computer equipment(USB cable or Bluetooth), Tablet/Phone(Bluetooth).
Status indication

Button Function User Action
Microsoft Teams button Short tap: Open Teams
Long tap: Raise hand during the meeting
Speaker volume up Short tap: Increase volume one step
Long tap: Increase volume to maximum in three second
Mute/Unmute microphone Short tap: Toggle mute/unmute mic
Speaker volume down Short tap: Decrease volume one step
Long tap: Decrease volume to minimum in three second
Answer/End call Short tap: Answer/End call
Long tap: Reject call

informationNOTE: The buttons on SL525 work best with Teams and Zoom.
informationNOTE: For other communication software, please access call controls via communication software UI.

Operation behavior in Teams and Zoom

informationNOTE: The device is Teams /Zoom certified for Wireless audio dongle & wired USB mode only.

  • Making Teams calls:
    Initiate a call through the Teams application on your computer.
    Making Teams calls
  • Making Zoom calls:
    Initiate a call through the Zoom application on your computer.
  • Answering Teams and Zoom calls:
    Press the Answer/End call button to answer the call.
    Answering Teams and Zoom calls
  • Adjusting the volume:
    • Press the Volume up button to increase the volume. An audio prompt tone can be heard when the Volume up button is pressed.
      Adjusting the volume - Step 1
    • Press the Volume down button to decrease the volume. An audio prompt tone can be heard when the Volume down button is pressed.
      Adjusting the volume - Step 2

Operation behavior on Button and LED

  • Powered on:
    When powered on, the top-center LED will turn white.
  • Incoming call:
    When receiving an incoming call, the Answer/End call LED blinks in white.
    • Short press Answer/End call button to pick up the call.
      Incoming call - Step 1
    • Long press Answer/End call button to reject the call.
      Incoming call - Step 2
  • During call(Microphone unmuted):
    Teams connected - Top center LED, Teams, Answer/End call, Mic LEDs will lit up with white color. If teams is not connected, Top center LED, Answer/End call, Mic LEDs will lit up with white color.
    During call(Microphone unmuted)
  • Microphone muted:
    When the microphone is muted, all the LEDs will turn red until the microphone is unmuted.
    Microphone muted
  • Adjusting volume:
    When adjusting volume, the ring of LEDs will temporarily light up in white to indicate volume level.
VOLUME STEP Volume shown on Windows
1 12
2 26
3 38
4 50
5 62
6 76
7 88
8 100
  • When volume up is pressed, LED will light up in clockwise direction.
    Adjusting volume - Step 1
  • When volume down is pressed, LED will go off in anti-clockwise direction.
    Adjusting volume - Step 2
  • Hanging up a call:
    When a call ends, short press Answer/End call button to hang up the call.
    Hanging up a call

Charging the speakerphone

European Union (EU) has a common charger requirement for wireless products that have an embedded rechargeable battery. For more information about the EU charging power requirements, see Charging power requirement.
For speakerphone charging, connect the USB Type-C cable to your speakerphone's USB-C port, and then attach the other end to a power source of your choice.
Charging the speakerphone
informationNOTE: For best results, ensure that the battery is fully charged before first-time use.

Dell Display and Peripheral Manager

What is Dell Display and Peripheral Manager?
Dell Display and Peripheral Manager is an app that helps you set up and configure your Dell monitors and peripherals. With this app you can make changes to settings of the device and provide additional customization like Audio Mode, Microphone, Audio Output, and more.

Installing Dell Dispaly and Peripheral Manager
When you connect the device to your computer for the first time, you will be prompted to download and install the app. Alternatively, you can manually install the software from Drivers & Downloads tab on dell.com/support/SL525/downloads.
For more details, please refer to the Dell Display and Peripheral Manager User Guide in the documentation tab.
informationNOTE: If Dell Display and Peripheral Manager does not appear within a few minutes, you can check for updates manually via Windows Update or download the Dell Peripheral Manager application from dell.com/support/ddpm.

Specification

General
Model number SL525 Dell Pro Plus Wireless Speakerphone
Connection type Wired(USB-C) / Wireless(Bluetooth, Dongle USB-C)
Supported operating systems
  • Win 11/10 64 Bit including Windows-on-ARM64
  • MacOS
  • Chrome OS
  • Linux Ubuntu 24.04
Power ratings
Operating voltage 5V
Dimensions and weight
Dimension 125mm x 39mm
Weight 355g
Speakerphone acoustic performance
Speaker
  • Type: Dynamic
  • Size: 60mm
  • Max Power: 8.0 W
  • Max Output: 86 dBSPL @ 0.5m
  • Frequency range: 90Hz~20kHz
Microphone
Omni-directional microphone
  • Quantity: 4
  • Sensitivity: -37 1 dBFS
Environmental
Dust / water ingression No

SL525's button behavior on communication application

*Microsoft Teams work as intended with SL525's buttons, table below has behavior of speakerphone buttons in most of the popular communication software.

Button
Function Mute/ Accept End Reject Volume Volume down
Communication application Unmute call call call up
Microsoft Teams BT OK OK OK OK OK OK
Dongle OK OK OK OK OK OK
USB wired OK OK OK OK OK OK
Zoom BT OK* X OK** X OK OK
Dongle OK OK* X OK OK OK
USB wired OK OK X OK OK OK
Google Meet BT X X X X OK OK
Dongle OK X OK X OK OK
USB wired OK X OK X OK OK
Slack BT OK* X X X OK OK
Dongle OK* X X X OK OK
USB wired X X X X OK OK
Amazon Chime BT OK* X X X OK OK
Dongle OK* X X X OK OK
USB wired OK* X X X OK OK
Cisco Webex BT OK X X X OK OK
Dongle OK* X X X OK OK
USB wired OK X X X OK OK
Rainbow
(Alcatel Lucent) 		BT OK* X X X OK OK
Dongle OK* X X X OK OK
USB wired OK* X X X OK OK
GoToMeeting BT OK* X X X OK OK
Dongle OK* X X X OK OK
USB wired X X X X OK OK
Cisco Jabber BT OK* X X X OK OK
Dongle OK* X X X OK OK
USB wired OK* X X X OK OK

informationNOTE: OK* indicates Mute/ Unmute button works as intended, but for these apps the status may not sync with the app interface.
informationNOTE: OK** indicates Answer/ End/ Reject Call button has 2 different states.

  1. Reject call - Can be done via long press Answer/ End Call button for one second on speakerphone.
  2. End an ongoing call - Can be done ONLY from Zoom app.

Statutory information

Battery Safety

  • SL525 has an integrated, non replaceable battery, do not attempt to open the device or replace the battery as this could result in personal injury and / or damage to the device.
  • Do not throw the product or used batteries inot fire or leave in places with temperatures above 45°C (104°F).

The equipment is intended for use in residential, commercial and non-congested industrial areas. The equipment belongs to class B for electromagnetic compatibility.

Terms and conditions of sale are specied in agreements with authorized resellers
The crossed out wheeled bin symbol indicates that used electrical and electronic equipment and batteries should not be disposed of with unsorted municipal waste; disposal of this type of waste should be carried out separately from other waste. The equipment meets the requirements of the Technical Regulations of the Customs Union "Electromagnetic compatibility of technical equipment" (TR CU 020/2011). The equipment meets the requirements of the Technical Regulations of the Eurasian Economic Union "On the Restriction of the Use of Hazardous Substances in Electrical and Electronic Products" (TR EAEU 037/2016).

Regulatory logo & storage

Regulatory logo & storage

Troubleshooting

Problems Possible solutions

Why does my speakerphone turn on/off unexpectedly

When not connected via Bluetooth or wireless, power behavior depends on:

  • PC sleep/hibernate settings
  • Charging status
  • USB port type (e.g., always-on)
  • OS and hardware platform

It may turn on/off automatically or stay on/off unexpectedly due to power management or USB configurations.
Suggestion:
Check your PC's power settings, USB port behavior, and consider disabling "USB selective suspend" for consistent performance.

Update your system's BIOS and SL525 firmware
  • LEDs blinking with pink color | SL525's firmware is updating.
  • Update the BIOS and drivers of your computer.
    For more information, see dell.com/support/drivers
  • Update your Dell Speakerphone SL525 firmware from.dell.com/support/drivers
  • Driver updates are only possible on Windows 10/11 64-Bit operating system.
  • Connect Dell Speakerphone SL525 to your computer before updating the firmware.
SL525's buttons don't respond while making a call via conferencing applications other than Teams
  • On applications other than Teams, it is recommended to use the in-app controls rather than the buttons on the Dell SL525.
  • Refer to speakerphone button behavior with various UC apps as above table in of the document.
Answer call button doesn't work when receiving calls from Teams
  • This occurs when you have multiple conferencing applications installed on your device and active simultaneously. In these scenarios, it is recommended to use the in-app controls rather than the buttons on the Dell Speakerphone SL525.

The Echo can be heard during the call
  • SL525 has the Echo cancellation feature, which minimizes and reduces any echo heard on calls.
    If you hear an echo from your device, it is possible that the user on the other end does not have the echo cancellation feature.

No audio
  • Disconnect and reconnect the Dell Speakerphone SL525 to your computer.
  • Check the computer sound setting and select the Dell Speakerphone SL525 as the playback device.
  • Adjust the volume settings to an adequate level.

Microphone doesn't work
  • Disconnect and reconnect the Dell Speakerphone SL525 to your computer.
  • Check the computer sound setting and select the Dell SL525 as the recording device.
Can't make a phone call or pick up an incoming call in device button via Line, WhatsApp and WeChat
  • The Answer Call button on the Dell Speakerphone SL525 is functional on Teams. For apps that are not supported, it is recommended to use the in-app controls rather than the buttons on the Dell Speakerphone SL525.

Abnormal sound
  • Remove any obstructions between SL525 and the user.
  • Reconnect SL525 with your device again.
  • Disable System Audio Enhancements.
When I mute or unmute the microphone using the Windows system control panel settings, the following issue or set of issues arises:
  • It does not correctly reflect the mute status on my speakerphone or within applications such as Teams and Zoom.
  • It results in delayed response on mute state in Teams and Zoom.
  • It displays error messages on Teams and Zoom.
  • Use the dedicated mute button on your speakerphone to control the mute or unmute feature in Teams and Zoom.
  • The Human Interface Device (HID) Telephony controls mute or unmute feature on Zoom and Teams. The mute button on your speakerphone supports HID Telephony but not by the Windows mute settings. Click the mute control on Teams and Zoom t ow response or error message.
  • Check the speakerphone connection mode – audio receiver or Bluetooth.
    Connect using the audio receiver because speakerphone buttons do not work when connected through Bluetooth.
The sound coming through the speakerphone appears to be at a lower or quieter level when I open the system control panel for audio devices
  • Close the control panel before using the speakerphone to listen to music or audio. The speakerphone has call and music modes with varying audio volumes.
    Accessing the system control panel temporarily switches it to call mode, but it reverts to music mode once you leave the control panel.

Volume control not working
  • Volume control key works only when the media is actively playing in the background.
Dell Pair notification does not open when a Bluetooth devices turned on for the first time
  • Windows 10 (version 19041) is the oldest version to support Dell Pair.
  • Bluetooth version 5.0 or later is available.
  • Bluetooth is supported on the computer. It has turned on under Windows settings.
  • The Bluetooth device supports detection by Dell Pair.
  • If the Bluetooth device is within the computer's detection range, and if the peripheral being connected is a mouse or keyboard, then pick up the device and move it closer to the PC.
  • Check that the computer and the Bluetooth devices have sufficient battery charge to operate.
  • The Bluetooth device must be updated to the latest firmware.
  • The Bluetooth controller on the computer is from Intel.
  • Power cycle the Bluetooth device.

Dell Pair reports a pairing error
  • Reconnect to Dell pair by performing the following steps:
  1. If a Bluetooth device is near the computer or in pairing mode, or if Dell Pair UI assists with the pairing process.
  2. Wait for the pairing error window to auto-dismiss, and then remove the Bluetooth device from the computer.
  3. Bring the Bluetooth device closer to the computer.
  4. Ensure that the Bluetooth device is in pairing mode and the pairing LED is blinking.
Bluetooth cannot auto reconnect to PC after PC restart - This is a known issue related to LE Audio PC
  • User can short-press Bluetooth button on SL525 to resolve the issue.
Multiple devices with a (?) are found in Device Manager
  • They are proprietary Bluetooth features or profiles that are supported by SL525.
    They are crucial for the proper functionality of Android/iOS phones. Since Windows is not using these profiles, Device Manager displays a (?) when no driver is loaded for these profiles.

Getting help

Contacting Dell
Dell provides several online and telephone-based support and service options. Availability varies by country or region and product, and some services may not be available in your area. To contact Dell for sales, technical support, or customer service issues:
Steps:

  1. Go to dell.com/support.
  2. Select your support category.
  3. Verify your country or region in the Choose a Country/Region drop-down list at the bottom of the page.
  4. Select the appropriate service or support link based on your need.
    informationNOTE: If you do not have an active Internet connection, you can find contact information on your purchase invoice, packing slip, bill, or Dell product catalog.

Charging power requirement

informationNOTE: The information in this section is applicable only to the European Union (EU) countries.

Charging power requirement
The power delivered by the charger must be between the minimum 2.5 W required by the radio equipment, and maximum 15 W in order to achieve the maximum charging speed.
Charging power requirement

Charging power requirement:
The power delivered by the charger must be between minimum 2.5 W required by the radio equipment, and maximum 15 W in order to achieve the maximum charging speed.

Notes, cautions, and warnings
informationNOTE: A NOTE indicates important information that helps you make better use of your product.

A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem

A WARNING indicates a potential for property damage, personal injury, or death.

Documents / Resources

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