X-TIGER Bike Tail Light Smart, Sport LED Rear Bike Lights USB Rechargeable Bicycle Taillight Auto On/Off, Ultra Bright LED Warning Back Strobe Flashlight

This like works great, charges quickly, etc. But it is not bright enough for daytime visibility. It works fine at night, but we ended up purchasing a different light since we need high visibility during daytime.

With the body crafted from aluminum and painted black, this LED tail light from X-Tiger looks great with a terrific form factor. No need to worry about water intrusion with this one unlike models that can take on moisture if the rubber flaps flies open as the connection port is securely hidden away behind the part that screws into the mount. The pulsing mode is pretty nifty and certainly much less jarring than the seizure-inducing rapid blinking that other models offer. Turning on and off the light with a push dead-center of the illumination means never worrying about hunting down the power button in the dark since it's in the most obvious location. A motion sensor in the unit monitors when the bike brakes and increases the luminosity to a constant beam to help warn any vehicles, with this function working under a variety of modes. A small green middle rim light surrounding the power button assist in confirmation of working mode, with one of the more useful modes being auto turn off after no movement being detected after about a minute to save on energy, and of course will activate the light again once under way. There are only two letdowns, both small but still bears worth mentioning. The first is that the cable included in the packaging might be the only one capable of charging the unit. We have PD-capable USB-C and Thunderbolt cables laying all around and tried three different ones with no indication of success but it charges up just fine with their own weak sauce offering. Second, the under-saddle mount feels like an afterthought. Packaged with the light were 4 small zip ties and 2 foam squares and a semi-flimsy hanger that just seems cobbled together for the sake of saying one could install it that way as a proof of concept. Overall, it's a great looking light that's bright enough with a high IQ and an attractive form factor.

Instructions can be a bit confusing, so this is a video demonstration to how to use the lights. Well built aluminum alloy casing. Nice rechargeable option with USB-C. To turn off the light, you need to go back into manual mode, and then press and hold

The auto braking feature is pretty cool and worked well when I tested it. The light is pretty bright and for its price is a decent value with all the extra features. I did find the different modes a little confusing but I'm sure I'll get used to it over time. One reason I bought this light was for the 2 different mounting systems (1 is to attach it to the saddle rails with a mounting bracket and the other is to the seatpost with a typical rubber strap). I though this would be really handy because I have several bikes with different setups, some of which have very thick (aero) seatposts that don't work well for typical bike light mounts. However, the mounting systems didn't work as well as I hoped. First of all the brackets feel like cheaply made plastic so I'm not sure how long the pieces will last. 2nd, you have to reuse the round part of the bracket for the 2 systems which means you have to use a screwdriver to switch from one mounting system to the other, which reduces the benefit of the 2 systems. 3rd, the under saddle mount zipties to the saddle which means you can only use it on one bike at a time without cutting and redoing the ziptie every time you switch bikes. Also not really a complaint but something to note: the under saddle mount might not work if your saddle is too far forward. Overall, its nice to have as a cheap but decent spare light.

This is a sweet little unit, with it's neatest feature being that you don't have to turn it on and off: Although there is a manual mode, I leave it here is auto mode: It goes to sleep after 45 seconds of not motion/vibration, and then wakes up if you move the bike. Even better, in one of the auto-modes, the light senses ambient light and during the day, it only uses the brake light; when it's dark, it both flashes and brakes. The second neatest function is the brake light. It transitions from either light off/light flashing to solid-on for 3 seconds whenever you slow down or brake. It's quite sensitive at picking up the change of velocity. I could even make it work as a brake light by holding it in my hand while walking and then slowing or stopping! The flashes and brake light are quite bright; no adjustment possible, nor necessary. It can be mounted either on the seat rails or seat post. Seat post is the easiest. You can also easily unscrew it from the mounting unit in order to keep it from thieves), but it's so small that most thieves would not bother with it. My only critique is that the instructions are very confusing. It's easy to cycle through the various flashing modes with a single click, but it's not at all obvious how to cycle through the four operating modes (e.g., light sensing, brake sensing, auto off, auto on). I did various things (e.g., double-click) and managed to get it into a mode where it works whenever the bike is moved (regardless of ambient light). It turns off by itself after no motion for 45 seconds. This is great.