[High Lumen/Brake Sensing] bicycle taillights use COB light source, high brightness, large aperture, and 180 degree visibility. Super bright brake lights and daytime running lights make you more visible to other road users. It is easier to add extra features to your driving safety. (rear light will turn on for 3 seconds when brake is detected) [double - click manual/automatic switch] double - click button to switch bike tail light to mode manual or automatic. Manual mode: long press on/off. Automatic mode: cannot be turned off, double - click must be set to switch to manual mode to stop. [6 lighting modes] Continuous lighting - 60lm / 5h Breathing lighting - 50lm / 9.3h Comet light - 50lm / 10.3h Slow light - 50lm / 9.1h Mixed light - 50lm / 11.6h Eco - flash - 30lm - 26.5 (if you want the mountain bike lights to last longer, please choose the sixth mode of light - Eco - flash) [ipx5 waterproof and USB rechargeable] the bicycle rear light is a waterproof and waterproof housing, which makes it a reliable companion in bad weather. 1h40 of charge = 26.5h of autonomy. Charging mode: power bank, USB CHARGER or computer (fully charged before first use). [Multi-functional safety light] The bicycle light is easy to install. You can install it under the saddle using a metal mounting bracket or on the seatpost using an adjustable silicone tape. Bike taillight that can be mounted on any bike handle, seat post, dog collar or anywhere. It can also be used as a helmet light, backpack light, warning light, etc. Dimensions: 11.1 x 6.1 x 4.6cm Package included: taillights*1, brackets*2, USB data cable*1, base stand*1, non-slip glue mat* 2, instruction * 1