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I've had these little teardrop SIGEM lights before, in red. Loved that little light, was super bright, and the battery lasted forever. Until it fell off without me noticing, which tends to happen with these small clip lights. When I re-ordered, I got the three-pack in green, blue, and red. That list is in the order of the brightness of the lights I received, which was kind of disappointing, especially that the red weren't brighter. The green are really bright and I couldn't be happier with those. I haven't counted the hours on a set of batteries but it is well into the double digits in slow flashing mode. The blue can't match the green in brightness but are still OK. But the red... Even with a fresh, fully-charged battery (I tried several sets), the red were really weak, not nearly as bright as I remember. So... when I got a nice e-mail from Amy at SIGEM asking me for feedback on my purchase, I e-mailed her my feelings on the red lights. Heard nothing. Then I got a second e-mail from her, once again asking for my feedback on my purchase. (Which I had aleady given, and they had missed or ignored.) I responded again, and let them know I thought it was strange that they would make such a personal plea for direct feedback via e-mail and then ignore two messages containing an honest and well-intentioned critique. The 2-star rating is for the SIGEM customer service and the red lights. I'd give the blue lights 4 solid stars and the green an overwhelming 5 stars.

I bought the set of 3 red flashers. My first thought when I opened the box was how tiny they looked. I checked Amazon again to see if the dimensions were shown and they are, but you don’t get a feel for the size until you actually see them. All three will fit in the palm of your hand. However, they will do the job. Especially in one of the flash modes. I turned them on inside my house during the day and have no issue with brightness. Perhaps those that said the light is weak have an old battery. Again, for brightness, the point of these flashers is not to be able to see with them, but to BE SEEN by others. The clip on the back is very strong. I have another brand that has a rubber strap and you had to use it because the spring clip on the back was so weak it wouldn't stay clipped to anything. Not a problem with this one. As advertised, they come with 2 spare CR2023 Lithium batteries. Standard batteries you can find anywhere. They also come with a tiny Phillips screwdriver. Don’t lose it unless you happen to have a screwdriver for adjusting eye glasses. The Velcro straps are 10” long but will stretch to about 14 1/4 inches. Of course you’ll need a couple inches overlap to stick together.

The first one lasted about six months before the batteries got weak; I was using it two to three hours a week.The second one lasted a couple of months before the switch became unreliable - click it and the light may or may not turn on/off. I replaced the batteries but it was still unreliable.The third one lasted a couple of months but then leaked and became unreliable (turning itself on, not turning off).I replaced the batteries in the first one and it works fine.Before you decide to purchase a 'better brand', take a careful look at the pictures - most of the vendors are selling the exact same lights, right down to the circuit board inside.<One week later> The first one also leaked and wouldn't turn off. I took it all the way apart - all 8 screws - and rinsed the circuit board; after letting it dry it works again. I wasn't out in the rain; I was just dripping wet with perspiration. These lights are not at all waterproof.I bought another brand that advertises itself as 'IPX4 rated', meaning resistant to splashed water. The plastic is _exactly_ the same shape, design, and size as these - I took apart one of the other brand and could interchange the circuit board, front plastic, and back plastic between the two brands. So before you look at this review and think "Oh, these are unreliable", consider the possibility that every single brand that looks like this is in fact made in the same factory, on the same assembly line, and the only difference is the logo and the price.

UPDATED: The review stands but let me tell you that the batteries are almost impossible to replace. Take into account that the originals do not last long and they take 2 batteries for each light, this unit is not very economical. I have struggled to replace the second unit's batteries for about 15 minutes but no luck putting the unit back together. IMPOSSIBLE!! The units are very good and have a great clip on but that is the issue putting them back together. Fortunately I use as a back up to my regular rear bike light, but two of the three have already died. The preinstalled batteries are already spent after just a few weeks. Good thing they are only back ups and the company sends additional batteries with the lights. Not enough. BTW - no directions on how to change the battery.

Update 04/08/2019: Wow, what can I say? Super disappointed! after only about 10hrs of use, i had to replace the batteries (replacement batteries included in box) in my blue light...Didn't go well. There are 2 batteries and one was very easy to replace, the other was STUCK in the bay. I had to pry it out with a pocket knife. replaced batteries and light wouldn't turn on. Grrrr....so I threw that one away and went to my backup red one. No problem, I left for work on my motorcycle and the older of the 2 lights is already burning out...I was thinking that the lights should last for at least 30 hrs or so...we're at about 10hrs (slow strobe setting). So, I'm going to attempt to change out the batteries with some I bought at WallyWorld and we shall see. if the light won't turn back on for whatever reason, then...I'm out.Great product! I use them on my backpack while riding my motorcycle on the way to work for a but if noticeability... Any little thing helps.Very bright and secure mounting clip

I was really disappointed in these lights. The red lights are not very bright (the white one is probably twice a bright).Also the first time I had the swap the batteries, I realised how poorly made/cheap these units are. The screw holes stripped out instantly on trying to reassemble the units after changing the batteries, which means any future battery replacement is going to just make things worse until the units cannot be reassembled. The whole battery-change setup with having to disassemble the units is frankly hopeless if you are using these regularly.Finally the metal hinge pin on the white unit has partially come out twice now just through general use and I have had to push it back into place. Thankfully I've noticed this in time, otherwise the entire clip would come off and I could have lost the unit.In short, these are a great concept, but poorly executed with a hopeless battery-change setup, poor quality plastics, average brightness LEDs and overall poor build quality making them unfortunately a "throw away" item.

Great for the first use. Unfortunately after that they refused to turn on unless you are continuously pressing the buttons. All 3 seem to be the same so presumably not a one off.

Really bright! Recommend attaching facing away from you!Used on dog harness, works really well!

Well made, easy to use, very bright and stayed secure on dogs collars. Able to see my 3 lively boxers on the beach at 5.30 am when it is still dark

Great product at a great price.