... stable +12V DC power; DVR can detect the short cut on VIDEO INPUT1/2/4 channel 6. VIDEO OUTPUT: 1channel, 1.0V,p-p,75 ... : 50fps(PAL), 60fps(NTSC) . 11. VIDEO BITRATE: 1.32Mbps ~ 3Mbps, 4 level video quality 12. AUDIO INPUT: 1/2/4 channel 13. AUDIO INPUT FORMAT: 20K ... : 1 channel,500Ω,RCA 15. AUDIO LEVEL: 1V ~2V, p-p 16. AUDIO COMPRESSION: G.711 17. STORAGE: Hard drive, SD card ...