BadaBang Interactive Bluetooth Target System Four, 1.75" circular target paddles Target requires 3 AA batteries to operate On/Off Switch located on backside of the target box Target box is spring loaded upon opening, providing your backstop and creating a trap for any misses Target paddles fold down conviently when closing the target box Connects to your smart device via bluetooth Works with up to 12 FPE of muzzle energy Target requires very little power to function properly, airsoft and BB pistols work well (eye protection is recommended, even when using low ricochet BBs). Target Box Dimensions: 13" L x 7" W x 2.65" H Compete against yourself or other players around the world in real time!