For more details:

1. Use of safety hammer.
 Lifesaving hammer is mainly used its the tip of the cone, because of the point contact area is very small, so when use hammer to hit the glass, the contact pressure of glass (not pressure, but pressure per unit area) is quite big, this is a little similar with the principle of the pins, membrane easily stabbed broke, and made the car glass at this point is a lot of outside forces and produce a slight craze, for toughened glass, a little bit of cracking means that the stress distribution within the whole piece of glass was damaged, and in an instant the spider mesh crack and at this time as long as gently with a hammer to hit a few times can rid the shards of glass.
The middle part of the tempered glass is the strongest, and the corners and edges are the weakest. The best way to do this is to use a safety hammer on the edges and corners of the glass, especially in the middle of the glass. Once the glass is cracked, you can knock a few more times. It is said that about two kilograms of pressure can smash the corners of the tempered glass.
 If you don't have a safety hammer, women's high heels are a good thing, too, and you can swing the heel up to make it harder, the thinner the heel, the better!
2. Attention:
 If you take a long bus ride, it is better to choose the exit from the safety gate or the roof of the car. If you want, you can take a closer look at how to open the safety door, because once an accident happens, you can't be quiet and look at the instructions.
Product features 
 When the car accident, (such as: car rolled over, fall river, etc.), the need to escape from the car, can use the cutter cut out at the end of the lifesaving hammer belts, reoccupy pointed lifesaving hammer broke the window glass, and then jump to escape. It is the last protective barrier for passenger life!
Product features:  
The design of this product is very excellent in appearance design, which is quite remarkable: it is more humanized and more practical than the general product. For example: its tail end, is an outstretched curved hook, unlike some products, this part does not protrude, and the handle is general, which increases the difficulty in the use of emergency. Just imagine how many people in an emergency would calmly turn their seat belts on the cut. On our this product, use more convenient, in the emergency, as long as people put it to the seat belt, it's out of the hook will naturally hook on your seat belt, and make the belt into the gap on the cutter, on the other hand, it is the base of the design, make the product with a very solid, let the car bump also won't fall, convenient and comfortable