Communication protocol Sip 2.0(rfc-3261) Master chip Broadcom 1190 Keys Design Stainless steel Direct-button 1 Numeric keypad Optional Voice Microphone 1 Amplifier 0.5w-10w Speaker 0.5w-2w Volume control Adjustable Fdsp Support(aec) Voice stream Supportable protocol Rtp Codec G.711, g.729 Port Power supply 12v+-15%/1a dc or poe Poe Poe 802.3af (class 0 - 12.95w) 48v/380ma Lan 10/100base-tx s auto-mdix, rj-45) Cables Hsyv or better Passive switch Normally open and normally closed highest at 30v/1a ac/dc Active switched output 12v/500ma dc Rs232 Supported Rfid/ic card reader Em-40xx (125khz) Supported Hid card (125khz, 26bit) Optional M1card(13.56mhz) Optional Structure Shell material Aluminum cover, plastic back case Operating temperature 0¡ãc to 55¡ãc Working condition relative humidity 10% - 95% Storage temperature -40¡ãc to 70¡ãc Installation Wall mount Size 159 *130 *40 mm Packaging specifications machine size:159 *130 *40( mm ) carton size:230 *170 *80( mm ) packaging material: pearl cotton, carton gross weight:1.3kg net weight:1.1kg