Support Ultra-Long Continuous Recording and Backup By USB. DVR can be set to automatically overwrite the oldest internally stored footage or you can transfer those video files by USB to a memory stick or external hard drive. Be notified when there are unexpected movements. Smart notifications with image will be pushed to your smartphone via iPhone/Android App. You also can setup the Detection zone from your DVR to minimize false alarms. The free app Zosi Smart lets you see all of your cameras in one place. Check in on your home or business wherever you have an internet connection. Free App for Live View & Playback on Smart Devices with WiFi or 2G/3G/4G Anywhere Anytime. Smart Phone Support: iPhone, Android ,Ipad