Cisco SPA112 2-Port Phone Adapter. Supported network protocols: IPv4, IPv6, ARP, DNS, SRV, DHCP, PPPoE, ICMP, TCP, UDP, RTP, RTCP, SNTP. VPN support: 802.1p. Security algorithms supported: SSL/TLS, Authentication method: SIP. Power requirements: AC, 100 - 240 V, 50 - 60 Hz, DC, 5 V, 2 A. Dimensions (WxDxH): 101 x 28 x 101 mm, Weight: 0.153 kg