The bike tail light makes your riding safer. Bright rear light enhances your visibility for night riding even daytime riding, auto brake light alerts other drivers behind you, provides additional safety. Multifunctions allows you to save more space on your bike and cost-saving. Features: Adopting fine quality energy-saving COB light beads, the brightness can reaches 60 lumens, improving cycling safety. The main body of the light is made of aluminum alloy material, more scratch resistant and wear-resistant. When braking is detected, the tail light automatically turn to high brightness mode for 2 seconds. In intelligent mode, when low light is detected while cycling, the light will automatically turn on. After stopping for 60 seconds, the light will automatically turn off. When cycling again while low light, the light will automatically turn on again. Compact size and light weight, do not bother your cycling. USB rechargeable design, with low battery warning function, you don't need to worry its battery. Manual mode and intelligent mode can be switched. High transmittance, light weight, strong impact resistance, clear, soft and uniform light distribution. The taillights adopt a IP65 waterproof design, which is not afraid of the impact of AdverseWeather. At the same time, there is no need to remove the taillights when washing the bike, making it more convenient. Equipped with 2 kinds of bracket, easy and convenient to install. Specifications: Type: W4, W4s (optional) Color: red, transparent (optional) Material: aluminum alloy Lumen: 60lm Waterproof: IP65 Battery: 3.7V, 400mAh Item size: 65 * 48 * 33mm / 2.6 * 1.9 * 1.3in Item weight: 40g / 1.4ounce Package size: 122 * 82 * 41mm / 4.8 * 3.2 * 1.6in Package weight: 84g / 3.0ounce Packing List: 1 * Bike Rear Light 2 * Bracket 1 * USB Cable