Lazer Tripwire creates a field of invisible beams that can be arranged to guard rooms, people, objects - anything that needs protecting. The receiver and emitter pods can be set on various surfaces to form straight lines of invisible light that trigger an alarm if someone crosses through them.To keep intruders out, place an emitter and receiver on opposite sides of an entryway, up to 6 feet apart. Or put the pods around a backpack to keep its contents secure. Position pods in inconspicuous areas, or leave them in plain sight on the floor or dresser to taunt your enemies. As long as the emitters line up with the receiver, a siren will sound if anything enters or exits the guarded territory.Lazer Tripwire is fun for all ages. When not needed to protect cubicles, dorm rooms, cookie jars or secret forts, Lazer Tripwire can be used as a game. Players challenge each other to maneuver around the invisible beams to retrieve objects without setting off the alarm.NOTE: Requires 6 AAA batteries, sold separately. Type: Sets Gender: Unisex Age: Child,Teen,Adult