Defender PRO Sentinel 8CH H.264 1 TB Smart Security DVR with Smart Phone Compatibility (21101) 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 4 years worth of footage on the included 1TB hard drive Choose motion-activated recording or H.264 compression to maximize storage space