Features 1、Anti Theft Feature: The bike security siren can emit a high sound (105‑115 decibels) to attract people's attention and deter thieves. Open distance, remote operating distance up to 50m (164 feet), easy to find your bike position by light or sound. 2、4 Lighting Modes: This bike alert tail light has 4 light modes, normal flash, breathing flash, fast flash, always on, you can use the remote to change any mode you like, or just press the button on the bike tail light Switch modes. 3、Brake Light: Bike brake light is designed with a brake sensor, and the automatic ultra bright brake light will automatically light up after braking. The bike lights are super bright and visible from a distance, really drawing attention to increase your safety. The brake sensor function is available in all light modes. 4、Auto On Off: This smart bike tail light includes motion sensor and light sensor and will automatically turn off when no motion is detected after 30 seconds. Once you touch it or detect that the bike is moving, the light will automatically turn on again. When you ride in the sun, the taillights will automatically turn off because the light sensor is working. 5、Multifunctional: This alert bike taillight can be charged by USB; 700mAh ultra long battery life; quick installation; high luminous flux brightness; IPX5 waterproof; brightness is adjustable, in always on mode, just long press the button to adjust the desired brightness. Specification Item Type: Smart Bike Tail Light Material: ABS Colour: Black Function: Anti Theft Host Built in Battery: Lithium Battery 700mAh Remote Control Built in Battery: 27A 12V Battery Capacity: 30mAh Package List 1 x Smart Bike Tail Light 1 x Remote Control 1 x Charging Cable 3 x Mounting Accessories 4 x Screw 4 x Nut 1 x Screwdriver 1 x Right Angle Wrench 2 x Cable Ties 2 x Mat 1 x Manual