... and image quality adjustable ,three optionPreview resolution: Host code: 4 channel H.264 D1(NTSC 720X480/PAL 720X576)/ 120 pcsTransmission code ... at the remote PC or mobileVideo output : One channel full screen or four channel division screen Local Storage: 8M SD , HDD ... optionRecord mode: Manual , alarm ,timed Audio intercom : One channel BNC Two-way intercom, aideo code G.72X, bit code ...