This compact DVR can record up to two cameras and can output the video feeds to view on a monitor. It records in MP4 compression and can handle resolution up to 640 x 480 for each channel. Footage records onto an SD card which can be lock protected to avoid tampering and the device can handle SD cards up to 128GB. It has loop recording and alarms that can be set to trigger the recording on and off. ***Note: This DVR is equipped with two 5 pin camera connections. In order to use an RCA camera, you need an RCA adaptor. ***Note: This DVR is only compatible with our standard definition cameras.