Ultra-bright LED bicycle tail light: Our bicycle taillights are equipped with 31 super bright LED lights, and a powerful flashing light up to 160 lumens reminds cyclists night and day, improving your visibility and safety. It includes slow flashing/breathing/fast flashing/constant light/emergency double flashing/taillight off modes, and you can choose 6 lighting modes at will. Smart 5-in-1 Taillight 1: It is worth mentioning that this bike has five functions of warning light/brake light/turn signal/electric bell/anti-theft alarm. It can remind pedestrians and vehicles in all directions, and effectively protect the safety of cars and drivers. I must say, it is a practical bicycle accessory! Bike anti-theft alarm: The bicycle anti-theft alarm can make loud sounds and vibrations, and the 110DB volume can scare away thieves effectively and protect your bike. In armed alarm state, if you touch or knock the bike, the host will issue a 2-second warning; if you touch or knock again within 2-12 seconds, the host will alarm continuously for 30 seconds to stop the thief. 7 levels of adjustable sensitivity, from light touch to pushing or hitting. Rechargeable and wireless USB remote control: The rear bicycle light has a built-in 2000mAh high capacity rechargeable battery. When fully charged in 7 hours, the taillight alarm can work for 70 hours. In addition, our wireless remote control bicycle tail light can be easily clipped onto 0.78-0.94 inch handlebars and is equipped with a replaceable CR2032 button battery. More importantly, the wireless range is up to 60m. Smart Auto On/Off: The bicycle alarm tail light features an intelligent and automatic "slow flash" or "breathing" mode. The bicycle taillight will automatically detect the brightness of the riding environment after 30 seconds. When you brake while riding, the bike light will immediately turn red for 2 seconds.