Yealink W80 DECT IP Multi-Cell system. Management protocols: TFTP/FTP/HTTP/HTTPS/RPS. Supported network protocols: SIP v1 (RFC2543). v2 (RFC3261). SNTP/NTP. VLAN (802.1Q and 802.1P). 802.1x. LLDP. STUN. UDP/TCP/TLS. Security algorithms: AES. HTTPS. SHA-256. SHA-384. SHA-512. SRTP. TLS. Phonebook capacity (per handset): 100 entries. Frequency range (EU): 1880 - 1900 MHz. Frequency range (US): 1920 - 1930 MHz. Maximum indoor range: 50 m. Product colour: White. Input voltage: 100 - 240 V. Output voltage: 5 V. Output current: 1.2 A