In case of emergency, you can use your car kit to break the window, remove the cap, press the trigger of firing pin against the window until it clicks.This life saving gadget has the power to get you out of trouble when you need it most.It has the metal Car Break Hammer to shatter the window of your car in an emergency situation.You can hang on a keychain, easy to carry.With lifesaving hammer, light Weight, convenient and easy to use. Specifications:Material: ABSSize: approx. 73 x 34 x 15mm Package includes:1 x Keychain Rescue Tool