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. A Micro Gear Set includes the Micro Spy Light (stealthily see in the dark), Invisible Ink Pen (write and read invisible messages), Micro Listener (listen to sounds from far away) and Micro Motion Alarm (motion and vibration sensor). Two AAA batteries are required for use and not included. Three 386/LR43 button cell batteries and three 357/LR44 button cell batteries are required for use and are included.