It can be used as an intimidating LED lamp for suspicious people aiming at cars, as a simple security device. How to replace batteries: 1. Open the top lid and 2. Lift the white base from the black case with a thin screwdriver. 3. Push the batteries from the LED side with a thin screwdriver between the round button battery cover and white base. 4. After replacing the battery, place the white base on the LED position and put it back into the case, and close the top lid with the original double-sided tape firmly and firmly press it on.