RDI Technology Co. Ltd. M420 用户手册

Move the joystick up and down to switch 
between languages. Press the joystick to 
select a language.

Press

, then select Alarm.

Select
Alarm

Select Alarm
Volume

You can set the volume of the alarm used by the 
timer and temperature alert functions. 

Move the joystick left and right to adjust 
the volume of the alarm.

Adjust alarm
volume

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