This $10 Keychain Could Save Your Life — But Not in 1 in 3 Cars

The resqme Original is the size of a car key fob. One end is a spring-loaded steel punch for side windows; the other hides a recessed blade for a jammed seatbelt. It hangs on your keyring, so unlike the emergency hammer in your boot, it is actually within reach when you need it.

It works. There is just one thing you must check first, and almost nobody does.

Why spring-loaded beats a hammer

You press it against the glass and a spring drives a hardened point into a single spot. No swing, no room needed, no strength required — which matters when you are belted into a seat at an angle you did not choose.

In 2019 the AAA tested six escape tools, three spring-loaded and three hammer-style. The spring-loaded ones performed better on tempered glass. And if the car is in water, a hammer is close to useless — you cannot swing one underwater with any force. A punch needs no swing at all.

The part that decides everything

Car side windows come in two kinds, and they behave completely differently.

Tempered glass is under internal stress. Break the surface at one point and the whole pane disintegrates into blunt pellets. That is what a punch is designed to trigger.

Laminated glass is two layers bonded to a plastic interlayer. It cracks and stays put — which is the entire point, because it stops occupants being ejected in a crash. Carmakers have been fitting it to side windows in growing numbers for exactly that reason.

In the AAA test, four of six tools shattered tempered side glass. None of the six broke laminated glass — it stayed intact even after cracking. And by 2018, roughly one in three new models had laminated side windows somewhere in the car.

To its credit, resqme says this plainly itself: the tool is designed to break tempered glass only.

The 30-second check to do today

Look at the bottom corner of each side window. There is a small etched label, and it will say tempered or laminated — sometimes under a trade name like Templex or Temperlite. Many cars mix the two, so check every window, not one.

Find your tempered window and remember which one it is. That is your exit. If the label is missing or unreadable, ask the dealer.

If every side window is laminated, no handheld tool will get you out, and the AAA’s advice changes: in a submerged car, move everyone to the rear or to an air pocket and wait. Once the cabin floods, the pressure equalises and a door can be opened.

Two more things worth knowing. Test the tool once on soft wood — a small indent means it works. And skip escape tools that bundle torches or phone chargers; the AAA found the extras add nothing to performance.

Worth it?

Yes — on one condition. A ten-dollar tool on your keyring beats a thirty-dollar hammer in the boot every time, because reachability is the whole game. But it is a key that only fits one kind of lock.

Spend half a minute reading the corners of your windows before you file this away as solved. The label tells you whether you own an escape plan or just a keyring ornament.