Using the DeWalt DCL040 flashlight is easy. First, make sure you have a compatible 20V MAX battery and charger (not included with the flashlight). Once you insert the battery, simply press the switch to turn on the light. You can use the integral hook to hang it up for hands - free use in different positions, or rotate the head up to 120° to adjust the lighting direction. When it comes to maintenance, keep the flashlight clean by wiping it with a dry cloth. Avoid exposing it to extreme heat or moisture. If the flashlight stops working properly, check the battery connection. Also, store the flashlight in a dry place when not in use to ensure its long - term performance.