Executive SIP Phone with 17,8 cm ( 7 inch )" capacitive touch screen, color display 800x640 pixels, built-in Bluetooth 4.0 module, Bluetooth headset support, USB headset support, full-duplex speakerphone, HD handset, and speaker, 2 line keys (max. 24, depending on the CallManager) 12 programmable system keys ( max. 48, depending on the CallManager), 30 context-sensitive and programmable system keys (max. 30, depending on the CallManager), expansion modules supported M680i and M685i, supports USB 2.0 Type A Jack, LCD QWERTY keyboard, PoE class 3 (PoE + with expansion module) 2 GigE ports (LAN / PC), stand (35 ° or 60 °), AC adapter must be purchased separately