Function Introduction; About The Battery; Technical Specifications - Retevis RT642 Manual

Quick guide to function:
Function
Quick guide
introduction
Long press "
sound and the display light, entering the intercom
mode.
Mute code
In standby state, the cursor will flash, indicating the
power saving state. Long press "
off the walkie talkie.
Press the "PTT" button when you speak to the
Communication
speaker. Listen when you release the button
The same group of walkie talkies must be set with
the same channel and CTCSS for intercom.
1. Short press "
flashes, then press "
channels.
2. Press "PTT" button to confirm the channel.
3. Long press "
screen and the volume flashes. Short press "
button to adjust volume
Short press "FM" button, the icon "
the unit enter the radio mode
1. Short press the "
station, the radio icon flashes to indicate that the
station is in the searching, and the radio icon
flashes to stop when it receives the station.
2. Long press "
flashes, and short press "
volume.
Long press "FM" button, "
keypad lock. Press "FM" button again to exit the
Lock keyboard
keypad lock.
function
When keypad is locked, only the power button and
the PTT button could be work normally.
" button, the earpiece prompt "Di"
" again to turn
" button, the channel number
" button to adjust
" button, the "v" shows on the
" flashes and
" button to enter the search
" button, the volume number
" button to adjust
" icon light up into the
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About the battery:

● Charging precautions:
Please charge new or unused batteries for a long time before use.
When the battery is found to be low, the radio indicator is empty and a
"beep" sound is heard in the headset. The battery must be charged at
this time.
When charging, the battery indicator will scroll to indicate the battery
level. If fully charged, the grid stops scrolling.
● Note：
It is recommended to use the original charger of this machine, or you
can use the regular brand mobile phone charger on the market. If the
inferior charger is used to damage the unit, the company is exempt
from liability.
The battery can be charged on the intercom, it is recommended to fill
it once, so as not to reduce the battery performance.

Technical specifications:

"
Frequency stability
Output power
Modulation
Residual frequency modulation
Audio distortion
Sensitivity
Adjacent channel selectivity
Intermodulation immunity
Signal to noise ratio
Audio distortion
Transmitter
≤±2.5ppm
≤0.5W
F3E
≤-35dB
<3%
Receiver
≤-122dBm
≥70dB
≥70dB
≥48dB
<3%
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