UMISHI LED Safety Light (6 Pack), Clip On Strobe Running Lights for Runners, Walking, Bicycle, Dog Collar, Stroller, Best Night High Visibility Accessories for Your Reflective Gear

These lights are perfect for clipping on the back of your shirt or the side of your sleeve. They are very bright and perfect for improving your chances of being seen.They come individually packaged in a box of 6. Each one has its own little screwdriver for opening the light to replace batteries when needed. I liked them so much I bought a second pack to give out to my friends. We all used them on a 6 day bicycle trip and they worked every time, and were beacons of light during rain and fog. I estimated that the batteries lasted about 30 hours before needing to be replaced. It uses 2032 size batteries.

Sounds crazy, but we hook the running light to our new puppy's harness when we put her out at night. She is easy to spot no matter where she runs, including in the bushes or under trees. The attachment clips on easily and yet will not fall off. The red light is very bright and easy to see at a distance.

The first one was not blinking so I used the supplied screw driver to open back. Removed back and batteries checked out O.K. wipe off contacts points. Unit then worked. The second one has one of the LED's dim...but it will work. I need to open up and wipe contacts and see if that helps.The supplied screw driver is O.K. but I'll use my own tool kit and open back so I don't strip the screw head. The supplied screw driver has a small handle and can't get the torque need to unscrew.Other than that the brightness and functionality is fine.

I got these to attach to my dog's collar and leash for nighttime walks. While it has three settings, I don't really use anything but the rapid flash. Nice that they come with batteries already to go and that they can be replaced. I did change out a battery already; not the easiest to do at first, but once I played around with it a bit, it became more evident how to do it. So far, I've used them for some hours and they seem to be just as bright. One of the units had a switch failure, though I think it's because my dog started to chew on it, so not the unit's fault. My wife couldn't get it to switch off and left it for me to deal with. I was out of town at the time and after a full day and night of being on, there was still some brightness to the flasher.

Ease of use plus durability and ,bright strobe light…they are small but can be seen for quite a distance even with car traffic and street lighting…I’ve purchased a couple of times..it should be noted that the blinking strobe lights tend to slow and fade within a couple of months of continuous use

Smaller than I was expecting, however, these produce a powerful light. Three different light positions, steady, strobe-flash fast, strobe flash slow. The Velcro strap is too tiny to use on a wrist, but battery is replaceable (which is unheard of these days), plus, each box comes with a tiny (and I mean tiny) Phillips head screwdriver to open up the back. Clip-on is secure. I plan to use them on a canvas pull-wagon for when I go to the store for groceries early, morning or at night. Highly recommend!

These are surprisingly lightweight, very bright, and provide versatile attachment. A stretchy velcro strap is included with each one, making it easy to place around arm or ankle. So inexpensive to keep one or two in the glove compartment of each car for roadside emergencies. Possible uses are endless. Great product; exceptional value.

They are not reliable enough to use as primary safety devices. Some of them turn off at random, and some turn off if jostled at all. I bought six, so I now double them up and hope that at least one will stay lit while I walk on a dark country road. I can see the units that are on my dog's harness, but not the units on the back of my belt.