VEHICLE SAFETY TOOL: Our bracelet come with tungsten carbide bead and emergency survival whistle, it offers the capability to break tempered safety glass & blow the whistle to attract attention EASY TO CARRY: This tool is lightweight and fully adjustable design, made of an elastic rubber band and a tungsten striker bead, it can make it effortless to break tempered glass. And the whistles are made with sturdy but lightweight aluminum MULTI-PURPOSE: The bracelet equipped with tungsten impact beads & whistle, the tungsten bead can shatter car side window glass for escape, and the whistle can blow in an emergency, is loud enough to draw attention in a large radius SUITABLE GIFT: Our bracelet glass breaker is suitable for various vehicles such as cars, buses, trucks, etc. It can be given as a gift to your parents, husband, wife, siblings, friends and teachers, and even more.This gadget can help you in unexpected situations PLEASE NOTE: Bracelet window breaker effective only against tempered glass commonly used in side windows， does not work on car windshields The bracelet come with tungsten striker bead and emergency survival whistle, it offers the capability to break tempered safety glass & blow the whistle to attract attention.