... impedance: 75Ω,Audio Compression G.726, G711, ADPCMAudio Input1 channel, RCA port, liner input, Impedance:1KOhmsAudio Output1channel,RCA port ... , linear outputAudio talk-back input1 channel ,MIC portOverlaid CaptionChannel Name, Date, Bit rate, position ... Support 802.11b/gSupport 3G, CDMA, and GPRS mobile network.Storage interfaceBuilt-in standard high speed SATA port ...