Changing Channels; Sending A Call Tone - Albrecht Tectalk Smile Manual

4.3. Changing Channels

Press the Channel Switch button to switch between the 3
available channels. Make sure that both units are set to the
same channel otherwise you will not be able to communicate
with your partner.
Note: if no button is pressed within 6 seconds during setting,
the device will return to stand-by mode.

4.4. Sending a call tone

Use the CALL Tone function to send a short melody to all other
receivers to signalize an upcoming transmission.
To send a call tone, short press the PTT button.
16
Channel LED Indicator
1 Left
2 Right
3 Left and right