LED Road Safety Flares Warning Disc Kit -Automotive Safety Products 4” Magnetic Roadside Flare Emergency Disc Beacon for Car Truck or Boat - Vehicle Emergency Kit 3 Pack with Carry Bag

I have not used them in any situation except for putting the batteries in and checking to make sure they work. The magnet is very strong and the lights are adequate. It is a little hard to open it up to put the batteries in and the orientation of putting it back together only goes one way.

I have never thought about something like this until I came across it. It took a couple seconds to get the back off, but easy to install batteries and get working. It works great! I hope I never have to use them, but I do feel better knowing I have these with me if I need them at night.

Sometimes your 4-ways are not enough illumination on very dark nights or inclement weather conditions. I like the idea of just sticking it to the side of your vehicle especially if you are changing a flat tire. Makes traffic get farther away when passing. I bought extra for all my adult kids to have. You just never know when you might need it. Very easy to use.

Tried prying, but thought it would break. Returned for refund.

Halo is an excellent product that works well and is easy to service. I have personally handled imitations that have cut corners in their construction which will eventually cause failure and one brand where it was impossible to install batteries because the five examples brought to me couldn't be opened.

Really like these. Work great with many options. Seem like they will be durable. Opening requires and knife or thin screwdriver. Just pry open.

Installing the batteries is a little pain. After unscrewing two screws, you have to apply some force in order to pop them open. Now, they definitely look tough enough to resist rain, snow, a car stepping on them, etc.They have not been used yet in a real emergency, but the different light patterns and the magnet to stick to metal should be more than sufficient to help you out in a real one.

Has so many forms of lights. Magnetic or hook. As the seller described. Highly recommended. Worth the price.