ZMODO 4CH Full D1 DVR Security System with 4 Vandal-proof CCD image sensor Outdoor Security Cameras No Hard Drive Check Video Footage Anywhere Anytime via PC or Smartphone-This system allows you to view your footage, no matter the time or location. Access your DVRs footage over the internet, or directly from your Android, iPhone, iPad, Symbian, Windows Mobile, or BlackBerry. Advanced Motion Detection Recording-The motion detection options allow you to record only when motion is detected to save hard drive space without missing important events. Scheduled Recording Options-Choose the specific days of the week and hours of the day you would like your DVR to record or not record. Easy USB Backup-A Built-in USB port gives you the option of backing up and transferring your video footage with a USB flash drive. Instant Email Alerts if Activity Detected-This system is designed to send an email alert, complete with photo of the activity, if any motion is detected, or if any camera experiences video loss.