Yealink W77P DECT Phone System • High-performance SIP cordless phone system • 4,6 cm ( 1,8 inch ) 128 x 160 TFT color screen with intuitive user interface • Ruggedized DECT handset with IP54 protection rating • 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)/Noise Cancellation • Up to 40-hour talk time • Up to 575-hour standby time • Quick charge: 10-minute charging time for 2- hour talk time • TLS and SRTP security encryption • Vibration alarm guarantees you not to miss any call even in noisy situations • Wall mountable charger