Koss TWS150i - True Wireless Earbuds Manual

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Included

Product Overview

1. Charging case with battery life status lights
2. USB charging port
3. Earbud status light
4. Touch strip
5. Voice mic
6. Acoustical vent hole
7. L/R indicator
8. Magnetic charging contacts

Specs

1. Bluetooth Version: Bluetooth V5.0
2. Input Power: 5.0V 380mA
3. Charging time: < 2h

Power On

Method 1

Open the charging case, the white lights will illuminate for 1 second. The earbuds will automatically power on.

Method 2

While earbuds are in an off state, touch and hold the touch strip of both earbuds for about 3 seconds, lights will illuminate for 1 second to show the earbuds are powered on.

* Protective film must be removed from earbuds before they can be powered on and paired

Pairing

Mobile Phones and Headphones

Power on the left and right earbuds as described in the "Power On" portion of this guide.
Find and select "KOSS TWS150i" in the Bluetooth list.

NOTE:

1. When power is on, the earbuds will auto-connect with the last connected device within 10 seconds. If the connection fails, the earbuds will enter pairing mode.
   
2. If the earbuds are not connected to any device, they will automatically turn off after 10 minutes

Connection Lost

Bluetooth Off

Problem: If Bluetooth on source device is turned off, the earbuds will automatically turn off after 10 minutes. If earbuds are disconnected, the L/R earbuds' red and white lights will flash alternately.

Solution: Make sure that the source device's Bluetooth is turned on; then power on earbuds again.

Out of Connection Range

Problem: If the connection between the device and the earbuds exceeds the effective range, the earbuds will power off automatically after 10 minutes.

Solution: Make sure that device is in range, then power on earbuds.

Factory Reset

1. Open the lid of the charging case and allow both earphones to power on.
2. While the earphones are in the charging case, tap the touch surface of either the left or right earphone 3 times and allow both earphones to power off. NOTE: Tap the touch surface of the earphone 3 times in less than 1 second.
3. Remove both earphones from the charging case and close the lid.
4. Press and hold the touch surface of either the left or right earphone until the LED flashes red 3 times (about 10 seconds).
5. Perform Step 4 with the opposite earphone.
6. Open the lid of the charging case and return both earphones. Close the lid.
7. Factory reset complete.

Incoming call

Answer Call

Double-tap on the L/R touch strip.

End Call

Double-tap on the L/R touch strip.

Reject Call

Long hold the L/R touch strip for 2 seconds.

Music

Pause/Play

Double tap the L/R earbud touch strip to pause/play music in standby or music mode.

While paused: Indicator lights illuminate once every 5 seconds
While playing: Indicator lights illuminate once every 5 seconds

Next Track

Hold the right earbud touch strip for 2s

Note: This function is not supported when L earbuds are used alone.

Previous Track

Hold the left earbud touch strip for 2s

Power Off

Place the earbuds into the charging case and closed the lid to automatically power down earbuds.

Charging

Earbuds Charging

Place the earbuds in the charging case.

Charging: The left and right lights of the charging case will flash
Fully charged: No charging case lights are illuminated

LED Status When the Charging Case Charges the Earbuds

The L side charging case light slowly flashes when the L earbud is charging.

The R side charging case light slowly flashes when the R earbud is charging.

When L and R earbuds are charged at the same time, the L and R charging case lights slowly flash at the same time.

When the earbud's batteries are full, the charging case lights will indicate the battery power level for 5 seconds.

Charging Case Light Language

LED status when the charging case is charging

When the power is below 30%, the left light flashes.

When the power is 30%~60%, the left light is always on and the center light flashes.

When the power is greater than 60%, the left and center lights are always on and the right light flashes.

When the power is 100%, all 3 lights remain on.

LED status when charging case is not charging

When the power is below 10%, the left light flashes.

When the power is 10%~30%, the left light is on.

When the power is 30%~60%, the left and center lights are on.

When power is 70%~100%, all 3 lights remain on.

Safety and Care

Using earbuds at high volumes for extended periods of time may result in permanent hearing damage. It is advised you keep volume levels moderate to low at all times for your safety.

Do not use while driving a car, cycling, operating machinery, or performing other activities that require hearing surrounding sounds.

Earbuds may not work properly under high temperature or high humidity conditions.

Do not use any corrosive cleaner/oil to clean the earbuds.
If the earbuds come in contact with liquids, quickly wipe away. If submerged in water, do not turn the earbuds on until completely dried.
Tips: liquid submersion voids the warranty.

Keep the earbuds and packaging out of reach of children.

Battery warning!

• Do not disassemble, strike, crush or put the battery into fire. Do not expose the battery to conductive materials, liquids, fire, or high temperatures.
• Do not allow metal objects to touch the two poles of the battery. Do not continue to use the battery if it has bulges, leaks, discoloration, odors, or any other abnormality.
• Do not use the battery after it has been submerged in water.
• If the battery is used improperly, it may explode or leak, causing burns and other personal injuries. If the battery leaks, it should be carefully disposed of according to the local laws and regulations concerning battery disposal.

Lithium ion Battery:

Model: 702334, 3.7V, 500mAh
GOLDEN CEL BATTERY CO. LTD.
Yinhu Industrial Park, Jiaoyitang Management Zone
Tngxia Town, Dongguan City, Guangzhou Province

Use this product in an environment with a temperature between 0℃ and 45℃; otherwise, it may damage your headset.

Bluetooth Earbuds Model: KOSS TWS250i
DC input: 5V380mA
Battery Capacity: 500mAh, 1.85Wh
Koss Corporation Made in China