switch instructions 1, battery positive towards +, negative outward --2, switch on the tail switch function Cheng'an switch function, two. A circuit board is used to illustrate the 1, the torch using advanced voltage constant current technology can effectively solve the LED flashlight on the voltage constant current requirements. 2, note: do not use A. overpressure, voltage should not exceed 4.2V B. battery positive roots forward, do not reverse, otherwise it will burn in the attention of the C. change control torch temperature, ensure the heat dissipation of the D. non professionals do not open