To Use: In order to power the unit on, one must click the power button 5 times repeatedly, until the LED screen turns on, (This could take a couple of tries if the 5 presses are not performed quickly enough.) From there, to operate the unit, one should press and hold the power button. When turning off, repeat the same 5-click operation, which will display the "Take Care" message and power the unit off. All the operational functions can also be found on the side panel of the small box that it came in. Product Description: Unleash the power of precision and fun with our Rechargeable Flashlight Mod! Designed for convenience, this 510 threaded flashlight mod comes with a built-in rechargeable battery, eliminating the need for disposable batteries. Rechargeable 510 Thread Battery: Environmentally friendly and cost-effective. Plug it in, charge, and you're ready to go! Versatile Everyday Uses: With multiple practical uses and endless fun possibilities, our Rechargeable Flashlight is the perfect companion for both work and play.