[2 in 1 Bike Taillight] Multi-functional anti-theft taillight designed with bike alarm, COB LED and 200 degree wide angle design, the LED bike light will make you more visible to other road users in the dark or during the day. We will keep you safe at all times. [Intelligent Brake Sensing Technology] With brake sensor design, super bright auto brake light will automatically turn on after braking. The bicycle light is very bright and visible from afar, it really attracts attention and improves your safety. [108db super loud] the bicycle security alarm can make a loud sound to attract people. attention of people. 108 DB strong is effective in scaring away thieves and also works as a bright tail light, remote smart alarm and electric doorbell. Two mounting methods for all types of bikes (see instruction manual for details) [ip65 waterproof and usb rechargeable] ip65 waterproof bicycle tail light , can be protected against splashing water from all angles. The built-in 800mah lithium-polymer battery comes with a USB cable that can be charged from a computer, wall charger, power bank or any other device with a USB port. After 3 hours charging, the taillight can work 20-40 hours in 3 different modes. [Easy to assemble and disassemble] Seat mounting bracket and adjustable silicone strap provided make the bike tail light flexible and can be quickly installed or locked on the bike, seat post, seat tube bracket. Very convenient to unscrew the mounting cover for filling. [size]:taillight: 50*42*43mm, Controller: 58*35*15mm