Review on VASTFIRE Smart Bike Lights with Auto On/Off Brake Light, 80 LM, 24 Hour Battery Life, Seat Post Mount, Wide 270° Beam, Red Safety Blinkers - Ideal for Night Riding on Road, Mountain, and Trail Bikes. by Joseph Reed

I've been cycling to work for about a year and am always looking for something to improve my profile in local traffic. Driving home during rush hour is always an exciting drive, especially the later it gets. I already use some accelerometer based lights on my bike but this one wins by a wide margin. The vertical bar is always a stop sign. It lights up for a few seconds when you stop. It also glows and pulses when you tumble and fall. A kind of "help" signal. Double-tapping the power button displays the remaining power on this vertical bar. Long pressing the power button turns on the backlight. You can switch between a few modes: Always On, Blink, Breathing, Dual Flash and Light Control. I use light control. At the bottom of the T is a tiny daylight sensor that detects ambient light. The light acts as a brake light while driving in this mode, but doesn't show any other lights unless it's dark. Then it's basically a constant light in the horizontal plane while driving. So far this is the brightest tail light I have. For this he will be my main light source. I installed mine to the seatpost in about 20 seconds using the o-ring that came with it. I would like a version that attaches permanently to the bike rack.