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