GXP2200EXT delivers additional functionality, versatility and flexibility to Grandstream’s GXP2140 and GXP2170 Enterprise IP Phones and GXV3240 Video IP Phone for Android. The GXP2200EXT module features a large 128 x 384 graphic LCD and 20 programmable buttons (each with dual color LED). It offers up to 40 extensions per module by using the 2 page switch keys and up to 160 buttons when 4 extension modules are daisy-chained together. This extension module is connected, powered, and controlled by the host phone to provide the benefit of additional extension keys instantly. The GXP2200EXT supports the traditional call features on each of its programmable buttons, BLF (busy lamp field, standard or event list), call park/pick-up, speed dial, presence, intercom, and conference/ transfer/forward. The GXP2200EXT is the ideal solution for any receptionist or businesses managing high call volume. When using the GXP2200EXT, the telephone attendant can ensure maximum productivity by efficiently monitoring and dispatching multiple incoming calls. Core Features: 128×384 backlit LCD display 20 programmable dual-color buttons per module, 2 pages per module (40 contacts total) BLF/speed dial Daisy-chain up to 4 modules for up to 160 contacts/extensions BLA (bridged line appearance)/SCA (shared call appearance), BLF (busy lamp field, standard or eventlist), Call Park/Pick-up, Speed Dial, Presence, Intercom, and conference/ transfer/forward and more