... INPUT GPS NMEA.183 SUPPORT2.5 INCH HARD DRIVE HR4001 stand alone DVR , digital video recorderMAX 4 VIDEO INPUT,4AUDIO INPUTGPS ... AND OFF,SUPPORT POWER DOWN AFTER SPECIFIED TIME ON ZGNITION REMOVABLE HARD DRIVE,SUPPORT2.5 INCH HARD DRIVE SHOCKPROOF CRADLE,RUGGEDISED ... modeLive video, recording, playback, alarm, backup simultaneously.GPSNMEA.183 HR4001 stand alone DVR