UNDERWATER APPLICABLE - Compared to traditional safety hammer, spring loaded device can easily break window even underwater from a submerged car, no fear of disturbed by water pressure.CAR ESCAPE TOOL - Car Safety hammer with premium tungsten steel alloy head window breaker and sharp stainless seat belt cutter, help you quickly escape in an accident.HIGH EFFICIENCY - Quality material and upgraded balance shaft firing structure provide it powerful crush with simply push, just takes 1 SECOND to break cars side window (10mm max thickness). Effortless sharp cutter enables you to cut the seatbelt quickly, just simply pull the ring-pull horizontally to take out protective cover.LIGHTWEIGHT & PORTABLE - Lightweight (0.98oz, 3.01.40.9in) and portable key chain design, convenient to carry in your car/key/bag/pocket, easy to access and escape from emergency.NECESSITY & GIFT - Set of 2. Its not only an inexpensive but highly efficient escape tool, but also a perfect gift with the delicate appearance and package.