... HARD DRIVE HR4001 stand alone DVR , digital video recorderMAX 4 VIDEO INPUT,4AUDIO INPUTGPS NMEA.183SUPPORT2.5 INCH HARD ... COMPRESSION TECHNOLGY,HIGH QUALITY VIDEO VIDEO RESOLUTION UP TO D1(704x574)FOR ONE CHANNEL MAX 4 VIDEO INPUT,4AUDIO INPUT 8Vto32V OPERATION ... ~32VPower out12V, DC, Max Current 1AVideo input4/2/1 channels, 1.0Vp-p, 75Ω, BNCVideo output1 channelVideo StandardPAL/NTSCAudio input2 ...