★Working voltage: 4.5V ★Can move the USB battery holder box, more convenient to use more convenient to use ★Easy installation: stainless steel spring fixed. It is very convenient to install and replace the battery, and it is not easy to damage other parts. ★Tough material: Made of tough material, good toughness, not easy to crack. ★The product does not include batteries. You need to purchase 3 AA batteries by yourself ★Working voltage: 4.5V ★Can move the USB battery holder box, more convenient to use more convenient to use ★Easy installation: stainless steel spring fixed. It is very convenient to install and replace the battery, and it is not easy to damage other parts. ★Tough material: Made of tough material, good toughness, not easy to crack. ★The product does not include batteries. You need to purchase 3 AA batteries by yourself