Plantronics CALISTO HEADSET WITH BLUETOOTH USB ADAPTER 56-K61A-15000 - Manual (Page 8)

4
The headset automatically powers up when it is charging.
Powering up: Press and hold Headset button for 2 seconds.
4 ascending beeps will sound when powered on.
Powering down: Press and hold Headset button for 4 seconds.
4 descending beeps will sound when powered off.
NOTE For your convenience, the headset comes pre-paired with the USB
Bluetooth adapter, and (if the headset is within range) will automatically
connect to the adapter when powered on.
The USB Bluetooth adapter is automatically powered on upon inserting into
the USB port of the computer.
Powering Your Headset and
USB Bluetooth Adapter