High-performance SIP cordless phone system 2.4? 240 x 320 color screen with intuitive user interface Up to 20 simultaneous calls Up to 10 VoIP accounts Up to 30-hour talk time (in ideal conditions) - Up to 400-hour standby time (in ideal conditions) Quick charging: 10-min charge time for 2-hour talk time TLS and SRTP security encryption Noise Reduction System Headset connection via 3.5 mm jack DECT radio coverage up to 50m indoors and 300m outdoors