V-store is a monitor 7 inches to display video advertising.You turn on and play video file when battery is inserted. Video length can't be more than 75 seconds. The motion sensor detect peoples front of the screen (range-2 meters) and play the videos, if no one in effect range, it will stay in power off. When you insert USB, the video files are uploaded on the V-store and play automatically. Button control volume ins included with removable battery. The autonomy is 30 days (15 sec video play 200 times/day).