Review on YOSKY Smart Bike Tail Light - Ultra Bright LED Warning Rechargeable Safety Red Taillight with Brake Sensing, Waterproof Auto On/Off Sensor - Bicycle Rear Light by Michael Syph

This light (and other more or less identical lights here at Revain) has two major design flaws that I think make it unsuitable for use as a bike tail light: 1.) It's impossible to get a flash of light while riding to force . Once set to blink, it becomes constant again once the bike starts moving. A blinking taillight is much better than a permanent taillight (probably why almost all other bike taillights have a constant blinking mode). in daylight than at night. Bright light is required, especially in daylight, to attract the attention of drivers approaching from behind. I returned the light and Revain refunded my money as I didn't want to send the light back. I think that's significant too.