This is the alarm system that alerts you when your golf bag is tampered with or moved. The system consists of a motion sensing radio transmitter disguised as a golf ball and a key fob radio receiver. The ball is placed into your golf bag and the key fob stays with you. The ball remains silent until it detects substantial movement, whereupon it emits a shrill alarm and sends a signal to the receiver, which beeps and vibrates. The alarm will also sound if the ball and key fob are separated by more than 30 yards (perhaps indicating a non-moving bag in a moving car, or that one of your foursome has mistakenly teed-off using the alarm). Fob 3" L x 2" W x 1" D. (2 oz.)