double-edged Safety / Hammer

The double-edged Safety Hammer is an improved design which overcomes the disadvantages of the traditional ones .It is more secure，effective and efficient when it is used for breaking down the glass.The double-edged Safety hammer is fixde on the window. It can only be used to crush the glass but can not be used for other damage.It is under the protection of secure shell which can avoid the misuse。Of course,it also has a emergency alarm system which can help people escape from the danger more quickly and safely.