I have two of these little lights for walking my dog at night. I attach one to my iPhone case and the other to my dog's harness. , solid red or flashing red - very bright, much better than other similar lights I've bought in the past. I'm not sure how many hours I can get on a single charge, but it seems like a ton! I use them 30-60 minutes a day, 7 days a week and have been charge free for weeks now. The only downside is that they are attached with a magnet and are quite strong, but when my dog does a full body shake it reverses. It still works with a harness or collar, but I use a safety pin on the other - I just slipped it through the plastic "skin"/case and it worked great.
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