Intelligent bike taillight, which integrates warning, brake taillight, turn signal, electric bell and anti-theft, wireless control, is a nice partner for your cycling. Features: 5 in 1: Multifunctional brake tail light, which integrates warning, brake taillight, turn signal, electric bell and anti-theft to meet your different needs and improve cycling safety. Multiple Light Modes: Support 6 light modes, red light flashing slowly/breathing/burst flashing/steady on, yellow light emergency double flashing and tail light off, one-key switching, easy to operate. Automatic Mode: When the taillight is in the intelligent automatic slow flashing or breathing mode, it will auto detect the brightness of the riding environment after 30 seconds of illumination, automatically turn off when it is bright, and automatically light up when it is dark. Brake Taillight: The light supports brake sensing. When there is a braking action when riding, the light will immediately switch to the high-brightness mode for two seconds, reminding the rear vehicle in time, and it is safer to ride at night. Anti-Theft Alarm: Support anti-theft alarm function, remove the remote controller to arm when parking, 110dB high decibel sound and light alarm scare off thieves, protecting your bike in real time. Long Endurance: Built-in 2200mAh large-capacity battery, support powered by power adapter, PC/laptop, power bank, etc., long endurance, no need to replace battery frequently, environmental protection and money saving. Wireless Control: Comes with a remote controller, supports turn signal, light mode switching, electric bell and arm/disarm keys, easy to control and smarter. No wiring is required, easy to install, saving time and effort. Reliable Quality: Made of high-quality PC material, it has nice durability, waterproof and dustproof, high and low temperature resistant, and can better cope with harsh outdoor environments. Specifications: Color: Black Material: PC Voltage: 5V Remote Controlling Distance: 30-60 Meters Transmit/Receive Frequency: 433.92MHz Host Battery: 1 * 18650 3.7V 2200mAh Lithium Battery Remote Controller Battery: 1 * CR2032 Button Battery Volume: 110dB Waterproof: YES Working Temperature: -40-60 Working Humidity: 80% Storage Temperature: -40-70 Taillight Size: 125 * 97 * 33mm/ 4.9 * 3.8 * 1.3in Remote Controller Size: 45 * 41 * 60mm/ 1.8 * 1.6 * 2.4in Package Size: 135 * 86 * 65mm/ 5.3 * 3.4 * 2.6in Package Weight: 271.4g/ 9.6oz Packing List: 1 * Taillight 1 * Light Bracket 1 * Remote Controller 1 * Controller Bracket 1 * USB Cable 1 * Wrench 1 * Lanyard 1 * Manual