"Yealink DECT IP Phone System • High-performance SIP cordless phone system • 2.4"" 240 x 320 TFT color screen with intuitive user interface • Up to 20 simultaneous calls • Up to 10 DECT cordless handsets • Up to 10 SIP accounts • Support Opus audio codec • Noise Reduction System • FNR (Flexible Noise Reduction) • Up to 21 hours talk time (in ideal conditions) • Up to 166 hours standby time (in ideal conditions) • Quick charging: 10-min charge time for 2-hour talk time • TLS and SRTP security encryption • Headset connection via Bluetooth or 3.5 mm jack • Vibration alarm gurantee you not to miss any call even in noisy situations • Charger wall mountable with PSU"