AiRide G2 - Call and Volume Management

4.2 Cellphone Function
Answering Call: Short press function once .
Hangup Call: After call , short press function once .
Refuse Call: Long press function button for 2 seconds .
Redial: Short press function button twice .
Volume Up: Press Volume + while talking .
Volume Down: Press Volume - while talking .
Manual/Auto Switch: Long press Function , Volume+ and Volume- at
the same time for 3S when Stand by .
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