Stand alone dvr Ntsc/pal Adjustable quality of picture Real time recording.Motion detection recording can be selected to save the size of hard disk and increase recording time. Manual recording mode, time recording mode and alarm recording mode. Automatic continued overwrite recording Audio recording(one channel):1channel input, 1channel output Chinese or english language Alarm from outside: four alarm input and one alarm output. Any size of hard disk, support current maximum size of hard disk in Support moving alarm recording, the moving alarm area is selectable Automatic spot protection when power-off, automatic resume when power on P.T.Z control enable with rs485 Equipped infrared remote control device Support network control