This bicycle tail light, with intelligent brake detection, high brightness warning light, USB rechargeable, waterproof, long-term endurance and other functions, improve riding safety, light and portable, simple installation, suitable for a variety of models.

Features:
Automatic brake detection function, tail lights flash when braking to warn vehicle coming from behind to ensure riding safety.
Red streamline highlight led, brightness 25LUX, a variety of flash mode.
The built-in rechargeable battery can be used for a long time at one time.
Waterproof grade: IPX4, suitable for use in small to moderate rain environment, please do not put the product in water immersion or use in heavy rain environment; please plug the USB cover tightly during use.
USB is rechargeable and easy to use.
Small and portable, easy to install.

Specifications:
Material: plastics
Input: direct current 5V, 0.5A
Battery: 5V, 900mAh
Item size: 65 * 54 * 42mm / 2.6 * 2.1 * 1.7in
Item weight: 100g / 3.5ounce
Package size: 150 * 100 * 50mm / 5.9 * 3.9 * 2.0in
Package weight: 128g / 4.5ounce

Packing List:
1 * Tail Light
1 * Rubber Ring
1 * Chargings Line