Intelligent bike taillight supports a variety of light modes, providing a safety guarantee for your night riding.. With 110dB high decibel anti-theft alarm, 7 levels of adjustable sensitivity, effectively protecting your bike. Reliable quality, with nice durability, built-in rechargeable battery, easy to install, is a nice partner for your riding. Features: Multi-functional bike tail light, which integrates warning, tail light and anti-theft function, support 4 light modes to meet your different use needs. When the taillight is in intelligent slow flash and breathing mode, it will auto detect the brightness of riding environment, automatically turn off when bright, and automatically light up when dark. Support anti-theft alarm function, 110dB high decibel sound and light alarm to scare away thieves and protect your bike. 7 levels of sensitivity adjustable. Built-in 700mAh rechargeable battery, support powered by power adapter, PC/laptop, power banks, etc., long endurance, no need to replace battery frequently. With remote controller, support light mode switching, arm/disarm keys and search bike functions, convenient and practical. High-quality PC and ultraviolet resistant material, with nice durability, IPX5 waterproof, even in light rain can be used. Delivery includes mounting bracket and wrench to help you complete the installation quickly, perfect for mountain bike or road bike. Specifications: Color: Black Material: PC Voltage: 5V Remote Controlling Distance: 40-60 Meters Transmit/Receive Frequency: 433.92MHz Host Battery: Built-in 700mAh Lithium Battery Remote Controller Battery: 1 * CR2032 Button Battery Volume: 110dB Light Size: 55 * 55 * 30mm/ 2.2 * 2.2 * 1.2in Package Size: 135 * 100 * 38mm/ 5.3 * 3.9 * 1.5in Package Weight: With 1 Remote Controller: 165g/ 5.8oz With 2 Remote Controller: 181g/ 6.4oz Packing List: 1 * Bike Taillight 2 * Remote Controller 1 * Bracket 1 * Wrench 2 * Protecting Mat