Sennheiser BW 900 Base station

BW 900 Base station -Hook switch – To take and end calls, to toggle between calls from office phone and mobile, and to transfer calls.
-Charging LEDs – Separate LEDs for headset and second battery: Shows charging status–on/off and % recharged.
-Hook LED – Shows headset status: Incoming calls; headset in use; out of range; call on hold; battery low. Mute LED – Shows microphone status: on/off.
-Headset/handset switch – To switch calls between headset and handset.