Sena Bluetooth SMH5 v1.3 User's Guide - Manual (Page 9)

SMH5
10
Note:
Be sure to connect the speaker cable securely to the main unit. It is strongly
recommended that you insert the cable tightly into the connector housing
while holding the main unit.
4. POWERING ON/OFF AND CHARGING
To power on and off the headset, you don’t need to press and hold
any button for several seconds. Just short press the Jog Dial and
the Phone Button simultaneously, and you will get quick on-and-off
convenience.
4.1 Powering On
Press the Jog Dial and the Phone Button at the same time for about
1 second to power on. The blue LED turns on and you will hear
ascending beeps.
4.2 Powering Off
Just short press the Jog Dial and the Phone Button simultaneously,
you don’t need to press and hold for a few seconds. The red LED
turns on for a while until it turns off completely and you will hear
descending beeps.