Bought these as a multi-purpose item, mainly as an emergency light for my car and motorbike in the event of a breakdown. A minor/trivial use was as a costume piece attached to a helmet. They have a very strong magnet and I used batteries for the suit as it was only temporary fun. I then bought emergency lithium batteries as I kept two in the trunk of my car for use. The singleton will sit in my motorcycle bag for this, and the lithium batteries will last a few years on standby before dying. Two lighting modes: steady on and slow flashing. Click between modes. Simple, direct, works great. Looks pretty bright, especially at night. I can't comment on the range or actual comparison to a traditional flash, but they should last a lot longer than a flash that burns out in a short amount of time, which I think is insufficient. And there is no risk of burns/fire with them. Even on a less than flat surface the magnet is VERY secure so don't worry about it slipping off or not having to attach it to the side of your car for example. It's not going anywhere. Small, handy and practical.
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