The flashlight adopts advanced voltage stabilization and constant current technology, which can effectively solve the requirements of LED flashlight for voltage stabilization and constant current. The head of this flashlight has a telescopic zoom function, which is very convenient. This flashlight uses 18650 lithium battery, which can be charged at any time, please do not overcharge or overdischarge. When the flashlight is in use, it is selected according to the requirements of the flashlight on the voltage and battery. Do not use it indiscriminately to avoid burning the circuit board. (Batteries not included) Do not use batteries of different types and voltages at the same time. The inner wall of the lamp cup should be kept clean and cannot be wiped with hands or hard objects; to remove fingerprints from the lens, please use a cotton swab and lens cleaner to gently wipe. The light of the flashlight should not be directed into people's eyes, it is super bright and very dazzling, so as not to affect the eyesight, especially for children.