Window Breaker Seatbelt Cutter Hammerdex Car Safety Hammer Safehammer Glass Breaker Emergency Escape Tool Car Window Breaker Tool Life-Saving Emergency One Second Broken Window (Red and Black)

There were no instructions - but it works great. One side is for cutting - and it's obvious which side has the blade. By default the opposite side is for breaking glass. they give you test glass. ALL YOU HAVE TO DO IS PUT THE BLACK TIP FLAT AGAINST THE GLASS AND PUSH INTO THE GLASS. THE GLASS WILL BREAK. Easy!

Poor or confused directions with bad Chinese to English translation so I have no idea how so called hammer works. They say use your head. Very strange and cheaply made in China.

Does not work all this is is a glorified seatbelt cutter knife. It won’t break a window there’s no spring or action mechanism