Vtuvia USB Rechargeable Bike Tail Light, Waterproof Bicycle LED Rear Light, 5 Flashing & Constant Modes with 2 Colors

The red/white version has a clear lens, as shown in my picture, not a red lens, as Amazon has it. The light is amazingly bright, and solid white mode could even be used as a headlight for some purposes, at least for a kids' bike. The one thing I really don't like is that slow flash mode (red) is an SOS pattern (3 short, 3 long, 3 short) -- not a good message to broadcast as you're just cruising around town or down a solitary bike path. And that's the only slow flash mode it has. I would not buy this one again -- I would recommend the other kind with a solid red lens, which have steady mode in three levels of brightness, and flashing at three different speeds (no SOS!).

I ordered two Red/White LED taillights, which I received in about a week. The first taillight turned on immediately. The second wouldn't turn on, and presumably needed to be charged.The taillights are nicely manufactured, and bigger than I anticipated. The dimensions are L = 4.0 in. W = 0.7 in, and H = 1.1 in, with H = 1.3 in that includes the attachment foot. There are 10 Red and 10 White LED lamps that are mounted on a 3.4-inch-long lighting strip. The patterns of lights that are sequentially switched are as follows: (1) steady Red, (2) steady White, (3) fast blinking Red lights, (4) the SOS flashed in Red, and (5) strobing Red LEDs alternating with strobing White LEDs. Additionally, the plasticized rubber mounting bands I received are thicker than all others that I had previously received that accompanied other lights, and which I viewed as a sign of quality. The USB charging cord provided is 9 inches long and sturdier than most.I charged both taillights. The second light tried to turn on for a moment, and then died completely. After a full charge, I placed the first taillight on steady RED mode. It burned brightly for almost five hours before dimming to the point where it was not usable. Five hours! Excellent!The alternating Red and White strobing lights are exceptionally bold and bright and command attention. While a single taillight helps make a bicycle visible, used in pairs or in addition to other lights, these taillights compel drivers to take notice. Safety is all about being seen early on and from a distance. And the degree of safety that can be achieved is directly proportional to the number and brightness of the lights that are strategically positioned and that can be seen from the front, sides, and rear of the bike. These taillights can help one to be seen and to arrive home safely at the end of the day - or night.The trouble is that out of two taillights ordered, one works brilliantly, and the other one failed on arrival. So, I am having a difficult time offering a recommendation. My preference was to reach out and contact the seller to resolve the problem prior to writing this review. But there is no apparent way for me to contact or message the seller directly. I would never recommend a product that would compromise someone's physical safety. But if you purchase this item, you may be putting your wallet at risk.In summary, one taillight was exceptional and exceeded my expectations. The second had a flicker of life as I watched it die before my eyes. I could just return them and ask for a refund. However, I liked the way the good taillight functioned, and would prefer that the non-functioning one be replaced. I will wait to see if the seller is responsive to this review.Follow Up:The seller contacted me via Amazon. He offered a refund, but I asked for a replacement, and it arrived in several days. It worked perfectly. So for the past two months I have been using both lights, attached to my rear cargo rack. They are very bright and visible in daylight. I often ride at night, and there is no question that I can be seen from blocks away. I am very pleased with these lights and with the customer service from a responsible seller that stands behind his product. And that allows me to change my rating to a full five stars, and to recommend these bicycle lights from this seller without hesitation.

at $5, this thing is a steal! Brightness like no other. I like that if you need that extra attention grabbing ability, you can set the rear light to flash the occasional white strobe. Which is naturally brighter than the red. So during the day that is the mode I run on. At night the regular strobe is plenty bright. I like that a single light can serve either in the front or rear role. Packaging makes me thing this is suppose to go up in retail stores. Top notch. Build quality is good, its a good size and weight. Your light search is over, buy this one. If you don't like it, you can give it to your kid or partner, but I will be keeping mine on.

One week I'd missed placed my regular head lamp, the white light was a good back-up, I wished it had a "flashing white light" too.

I purchased this for my E bike. Easy install super bright. Very strong purchase for the money.

They are easy great little lights but apparently they don't last long! One of then died the 4th time I used it & it was just down the street

Well made, easy to install and remove. Only lasts two hours!

Great product, great customer service.Lights work great. Very bright.