The Defender SN502-4CH-002 is a complete DVR security system that has all the latest features yet is very easy to use. It has been specifically designed for do-it-yourself applications. This kit includes a four channel DVR with built-in hard drive, four indoor/outdoor night vision cameras, and all accessories needed to start monitoring your property immediately. Setup is fast and hassle-free because everything you need is included and an interactive coaching menu helps you along the way. Industry-leading features like smart phone access and H.264 compression help you maximize the system and achieve a high level of protection.