Defender Sentinel 16CH H.264 500GB Smart Security DVR with Smart Phone Compatibility (21041) Easy-to-use system functions just like a computer; View anytime, anywhere with remote viewing via internet, smartphone, and tablet Receive email alerts, with photo, when motion is detected on your property Record over 2 years worth of footage on the included 500 GB hard drive 1 Step Remote Viewing software download auto-networks your DVR in minutes Choose motion-activated recording or H.264 compression to maximize storage space; Add up to 16 cameras for large property monitoring