Motorola BOOM Manual page 16

Caller ID
If your phone knows the caller's number, you'll
hear "call from <number>" on an incoming call.
Note: This feature is phone/network dependent.
Battery readout
When you're not in a call, press the Volume Up
and Volume Down buttons to hear how much
battery talk-time is left on your headset.
Tip: To save battery power, turn off the headset
when you're not using it.
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