How do I adjust the volume on my walkie talkie?
Press and hold the Volume button for three seconds to enter volume adjustment mode. Press the up arrow to increase volume or the down arrow to decrease volume. When the volume reaches level 0, the mute icon appears permanently on screen. Do not hold the radio close to your ear as uncomfortable volume levels could hurt your ear.
From the official Onn Walkie Talkie manual, page 1
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