This camera is a complete DVR system solution. built-in DVR that records 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, * 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 using good quality cards, and the machine does not include a card by default) * A 32GB Micro SD-card can store upto 4days 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 Facts As per my Experience: 1. Night Vision is not Excellent but Good with Reddish Color. 2. Record with Audio & Video. Audio is very good. 3. There is no better quality Camera available in the world with Memory Card Slot.