Power: 3 AG10 button batteries (3 batteries per lamp)
Installation method: screw on the valve of the wheel
Replacing the battery: When removing the battery do not rub two or more batteries together which will cause the battery short circuit.

Precautions:
1. The battery installation needs to be positive (the positive side is with word).
2. The looseness of the circuit board inside the lamp head is normal. Be careful not to drop the circuit board when unloading the lamp.