5,1 cm ( 2 Zoll ) 240 x 320 color screen 4 SIP Lines Built-in dual-band Wi-Fi (2.4G/5G) Support IEEE802.11k/v/r roaming Support WPA / WPA2-PSK and 802.1X EAP encryption to ensure communications security Built-in Bluetooth 5.0 can be used to connect  wireless earphone  No operation screen after 10 seconds during a call One configurable push-to-talk (PTT) button for quick dial Up to 9 hours talk time and up to 200 hours standby time