This camera is a complete DVR system solution. It has functions of real time viewing (video out), real time video recording on built-in Micro SD-Card storage (Memory Card is not the Part of Listing), night vision and cycle recording. Simple operation, just insert a Micro-SD card, plug into a wall power socket, it will auto start video recording, if you want to view real time images, connect the video output to a monitor. BNC Video output interface (BNC converter included) Motion Detection, recording video when object motion being detected, it can save storage spac Circular recording, when storage (Micro SD-card) is full, new video file will replace the first one, second, third and so on, never worry about run out of storage. Files will be saved in 30mins per file Built-in infrared LEDs, 24 IR LEDs are built-in, clearly see objects in dark environment or at night time Using external storage media, support Micro SD-card, video files are stored inside, Max. support up to 32GB (Recommend to use Class4 Cards, and the machine does not include a card by default) A 16GB Micro SD-card can store upto 24hrs video files 3.6mm camera LEN by default, the viewing angle is around 72 degree To playback video, just take out the card plug it into computer (a card reader is included), recommend using VLC media player .