This Dual USB Car Charger &Emergency Escape Hammer is also designed to break glass if you ever get into a situation where you are stuck inside your car. The safety hammer function at the opposite end is able to break your cars window from the inside or outside. It’s always a good option to have, even if you dont think you will ever need it. Plus, this charger is compatible with all USB-enabled devices! Grab this great gadget and always be prepared for the worst!