Sennheiser BW 900 - Manual (Page 6)

Delivery includes
6
interface provides for seamless changeover between your fixed line
phone and any Bluetooth-enabled phone paired.
Non-stop talking
Should the battery run flat while you are talking via your office phone,
you can easily replace it with a fully charged battery without terminating
your call. While no battery is being connected, the BW 900 base station
maintains the connection to the telephone line.
Delivery includes
1 BW 900 base station
1 BW 900 Bluetooth headset
1 rechargeable Li-polymer battery, partially pre-charged
3 speaker adjustment rings,
sizes S, M (pre-assembled on speaker) and L
1 phone connecting cable already plugged to base station
1 quick guide
1 CD with detailed instruction manual (PDF)
1 power supply
1 microphone windshield
1 battery dummy, inserted in the base station’s spare battery charging
slot