... audio, GPS, Vehicle Speed ,PTZ and alarm in and outVideo input : 4 channel CVBS(PAL/NTSC),BNC interface, adjustAudio input: ... One channel full screen or four channel division screen Local Storage: 8M SD , HDD optionRecord mode: Manual , alarm ,timed Audio intercom : One channel BNC ... /out : 1channel Sensor in ,1channel alarm out,( on , off, earthing)PTZ serial : 1 channel RS485, support Pan/Tilt/ Zoom( ...