COSOOS Mini LED Headlamp Flashlight - Ultra Lightweight 1.6oz Waterproof Headlamp for Running, Camping, Hiking & Reading - Hands-Free Bright Headlight for Adults & Kids (Includes Carrying Case, No AA Battery Needed) - Perfect for Night Jogging, Outdoor Adventures & Emergency Situations

Nice lightweight headlamp. Head band adjusts and can fit my large noggin. Three brightness levels. One click is medium brightness, second click is maximum brightness. If you hold the orange button continuously then the side lights come on instead of the center bulb. That setting is best for reading a book, a more diffuse light.I just received this headlamp and incorrectly believed that the light was dim. It wasn't the light but I had a defective rechargeable battery, came back and changed my review. Light output is great for indoors during a blackout. I have no idea how well it would work camping or jogging.There are no instructions in the box. You will not know how to safely open the battery compartment. Here is how you do it. Click the headlamps head down and you can now see the back of the headlamp. You will be able to now see a gap under the latch. I used a Swiss Army screwdriver and popped it open. You can probably use a coin or any small object. Longer fingernails might bend under the pressure of prying open the latch.Get this headlamp that only needs a single AA and get another headlamp that uses AAA. That way when a hurricane/blackout/etc occurs you will have options to scavenge for batteries around your house, if need be.I bought this AAA headlamp too and I'm ready for bad weather and blackouts. Once you use a headlamp you can't go back to using handheld flashlights.https://www.amazon.com/Headlamp-Lighting-Lightweight-Headlight-Batteries/dp/B005FEGYJC?ref_=bl_dp_s_web_3033804011(EDIT) Dec 2019 COSOOS headlamp has been working perfectly since I bought it and I even bought a second backup COSOOS headlamp. No problems whatsoever with either of my headlamps, I'm very pleased.I was wondering how long the COSOOS headlamp would last with the "two side lights" (reading lights) powered on before draining the battery.I decided to test how long the "two side lights" would last. I don't use alkaline batteries. I use rechargeable batteries for my devices. I didn't want to test using my Eneloops because that is a really good battery. So I decided to use my AA Nuon 2500 mAh 1.2V battery.CAVEAT - A fully charged 1.5V alkaline battery would last longer than my 1.2V battery.I charged my rechargeable Nuon AA 1.2V battery and made sure it was 100% fully charged. I put the headlamp in the bathroom with the "two side lights" on, aimed headlamp at the ceiling, left it alone. Grabbed my phone and used a stopwatch app, checking on the headlamp about every hour or so.After 6 hours and 10 minutes the headlamp was still burning but I could tell it was quite a bit dimmer. I put on the headlamp and could easily read the print on various items in the bathroom. I came back to check on it at 6 hours and 35 minutes. Uh oh, the bathroom was totally dark. I'm not sure the precise time the light went off. The 1.2V battery lasted somewhere between 6:10 and 6:35. I'm going to assume that it lasted 6:11. Pretend it lasted 6 hours. That means that you could get 24 hours of reading and usable light around the house with four 1.2V batteries. I do wonder how well alkaline batteries would last compared to rechargeable batteries.I've heard that using a flashlight in the freezing cold will increase the battery drain. The temperature in the bathroom was about 68 (68 Fahrenheit, 20 Celsius). If you are out in the freezing cold your battery life could be compromised. But many people say that only applies to alkaline batteries. But some people say that it also effects rechargeable batteries. Food for thought.For hurricanes, blizzards, blackouts, dog walking, jogging, etc. I would be very happy with my headlamp because I have access to plenty of spare batteries. But if I was camping or someplace that I couldn't get my hands on a new battery, I would avoid this headlamp and pay more to get a headlamp with better battery life.I don't own a Petzl headlamp or even used one before. But the Petzl brand seems to have a very long battery life. If I was hiking in the woods at night or exploring caves or an abandoned building or Dracula's castle, then I'd want a headlamp that could go for hours and hours and hours. lol (You could just carry spare batteries in your pocket)The COSOOS is a five star headlamp that cost 8 bucks. The Tikka Petzl cost 29 bucks. Two things that that I wish the COSOOS had would be a low lumen reading light setting and a red light. As long as you have multiple batteries the COSOOS is a fantastic headlamp. I can remove the drained battery and switch in a fresh battery in my COSOOS with my eyes closed in the dark. I have another type of headlamp that uses three AAA batteries it's easy to switch out the AAA batteries, that is if you have the lights on. The only nitpick I really have with my COSOOS is it doesn't have a 5-8 lumen reading setting.I've turned of all the lights and made sandwiches, washed dishes and walked around the house with no problems. COSOOS is a very lightweight headlamp and you forget you are wearing it. If the electricity suddenly goes out then you are going to want a headlamp or two. Keep all your batteries in the same kitchen drawer so you can find them when you need them in a hurry.I used to be a flashlight guy but I much prefer a headlamp. A heavy metal flashlight might be in order if you are going to take a small yapping dog on neighborhood walks and she challenges every dog behind every fence. In that case a headlamp isn't going to be of any use. You are going to need an aluminum MagLite flashlight (club) and hope that Cujo doesn't dig under the fence and try to eat your yapping dog. Small dogs think they are lions.PETZL TIKKASUPPOSEDLY 60 hours of battery life on high.SUPPOSEDLY 240 hours of battery life on low. I believe that low is the reading light setting. https://www.amazon.com/dp/B01KYTU6BO/?coliid=I1HEDQ93OQR0NIPETZL - Tikka Headlamp, 200 Lumens, Standard Lightingby PETZL