The Boo Box is a mini paranormal music box with a PIR motion sensor that detects movement for ghost hunting. The sensor detects movement up to approximately 15 feet in distance. When the sensor detects movement, a red light will turn on, and it will begin to play creepy music for 10 seconds. This device is very simple to use: simply place it where you'd like, turn it on, and wait for it to detect movement. If you are planning on investigating a large location, you may want to purchase multiple devices for maximum coverage. Requires 3 AAA batteries (not included). Dimensions: 2.5" x 2" x 1". Fast & Free Shipping!