Spy X is a Jr. Spy Line that is perfect for boys between six and 16 years old. Taking design cues from cutting edge technology and real field equipment, it's the next generation of cool. The designs are rough and tough just what boys are looking for. The Micro Motion Alarm will detect the movement of anything that comes within its reach. It can also detect vibration so put it on something you don't want touched and it will activate if that item is moved. Two AAA batteries are required for use and are not included.