AirLive VOIP-120A. VoIP protocols: SIP v1 (RFC2543), v2 (RFC3261). Security algorithms supported: HTTPS, MD5. Power requirements: 110-220V AC, 60Hz. Dimensions (WxDxH): 99 x 99 x 32 mm, Weight: 150 g. Operating temperature range (T-T): 0 - 40 °C, Operating relative humidity range: 10 - 90 %