Please kindly noted that this item is sold by Prettyacle from Joybuy marketplace. Description The item is a portable and practical bike cycling safety tail light, which features waterproof function, and is specially designed to ensure your outdoor riding safety at night or in the darkness. Can effectively improve the security of night riding. Besides, it comes with a round bracket for easy to install the taillight on your bike. Features - LED light color: Blue. - Material: Plastic. - Size: About 9 x 6.2 x 2.6 cm. - The safety taillight adopts the international safety standard Class IIIA but not directly to the eyes. - Suitable for 20-30mm diameter seat rod. - Two LED lights are really high-lit LED caps, with super brightness, multi-mode switching. - Recommended to use no. 7 900mA rechargeable nickel metal hydride battery, which can work continuously for 9 hours with full function. - Allow you to feel comfortable and enjoy the pleasure of traveling. - Designed with skull shape, specially sturdy adjustable buckle, strong elasticity and impact resistance, no need to worry about breaking or breaking. - Warm tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement and etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! The safety taillight adopts the international safety standard Class IIIA but not directly to the eyes Suitable for 20-30mm diameter seat rod Two LED lights are really high-lit LED caps, with super brightness, multi-mode switching Recommended to use no 7 900mA rechargeable nickel metal hydride battery, which can work continuously for 9 hours with full function