4. Using the Product4.1. Turning the Power On and OffPress and hold the power button ( ) for 2 seconds or more to turn the power on. Press and hold again for 2seconds or more to turn off the power.Note• When not charging, if there is no operation for 3 minutes or more, the power turns off automatically(automatic power off function).4.2. Adjusting the Speaker VolumeThe speaker volume is adjusted by pressing the Volume +/- button ( ). If you press and hold for 0.5 secondsor more, the volume changes continuously.Note• Adjust the speaker volume so that the sound does not break up. Echoes may occur for the otherperson on the call.• When connected to a computer via USB cable, when the speaker volume setting is changed on thecomputer, the speaker volume of this product also changes according to that value.4.3. Muting/Unmuting the MicrophoneYou can temporarily stop (mute) the microphone function.4.3.1. Muting the MicrophonePress the microphone mute button ( ).The microphone indicator changes color to red and the microphone is muted.4.3.2. Unmuting the MicrophonePress the microphone mute button ( ) while the microphone is muted.The microphone indicator changes color to green and the microphone is unmuted.4. Using the Product16 | 4.1. Turning the Power On and Off