D-Link 2-Port VoIP Station Gateway with Built-in 4-Port Switch. Management protocols: SIP2 (RFC3261), SIP1 (RFC2543), V.21/V.25. Dimensions (WxDxH): 192 x 118 x 31 mm. Power requirements: 12VDC/1.2A. Operating temperature range (T-T): 0 - 50 °C, Storage temperature range (T-T): -10 - 55 °C, Operating relative humidity range: 5 - 95 %. Safety: UL/CUL