Sena Bluetooth SM10 v1.1 User's Guide - Manual (Page 17)

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6.3 Mute or un-mute AUX
To mute or un-mute AUX, press and hold the Pairing Button
for 2 seconds
6.4 Audio Boosting
You can boost the audio input volume for both the AUDIO IN
Port and AUX Port of the SM10 by double tapping the Pairing
Button in the center of the SM10. This is especially helpful in
case the audio device doesn't have enough volume output.
Since sudden volume change can harm your ears, it is strongly
recommended to perform the audio boosting function only
when the music is not streaming. You may disable it by double
tapping the pairing button again.
6.5 Reset to Factory Default Settings
1. Power on the SM10, press the Pairing Button on the SM10 for
14 seconds until the Blue and Red LED is rapidly flashing.
2. Within 10 seconds, press Pairing Button to confirm reset.
The SM10 will be restored to factory settings and returns to
standby mode.
3. If you don’t press the Pairing Button within 10 seconds, the reset
attempt is canceled and the SM10 returns to standby mode.