In an emergency, you can use the car kit to break the window, remove the cover, press the escape device to the end heard bang bang of broken glass, emergency escape. Including crushing the window glass, cutting the seat belt, whistling for help, three functions. Its shell is made of ABS material with super smooth edges, strong and durable. Mini size design with keychain, lightweight easier to carry wherever you go. You can either put it in your pocket or connect to the key ring, good water resistance and durability. Not easy to damage it. Even in the water Still work very well, will not influence it features. Qty over 10K by Ocean.