Features1Intelligent brake taillight, support brake/vibration/light sensing, manual and automatic mode one-key switch, energy saving and environmental conservation. 2High-quality LED light source, high brightness, large aperture, 180 Degree visible, effectively remind the pedestrians and vehicle behind, make the ride safer. 36 light modes can be freely switched, constant light, breathing light, comet flashing, slow flashing, mixed flashing and EOC flashing. 4Support slope adaption, when going downhill, the chip automatically corrects the angle according to the algorithm to ensure the accuracy of brake sensing. 5Built-in high-capacity rechargeable battery, low power consumption, long endurance. With power reminder, real-time understanding of the battery status. 6High-quality ABS material, with nice durability, sturdy and aging resistant. Waterproof design, fearless of rainy days. 7Delivery includes mounting bracket, support seatpost and saddle installation, convenient and quick, suitable for mountain bikes and road bikes.SpecificationIntelligent brake light, with 6 light modes, is a nice companions for your Cycle. Built-in large-capacity battery, low power consumption and long endurance. Small and lightweight, waterproof design, no fear of rainy days. Features:Intelligent brake taillight, support brake/vibration/light sensing, manual and automatic mode one-key switch, energy saving and environmental conservation. High-quality LED light source, high brightness, large aperture, 180 Degree visible, effectively remind the pedestrians and vehicle behind, make the ride safer. 6 light modes can be freely switched, constant light, breathing light, comet flashing, slow flashing, mixed flashing and EOC flashing. Support slope adaption, when going downhill, the chip automatically corrects the angle according to the algorithm to ensure the accuracy of brake sensing. Built-in high-capacity rechargeable battery, low power consumption, long endurance. With power reminder, real-time understanding of the battery status. High-quality ABS material, with nice durability, sturdy and aging resistant. Waterproof design, fearless of rainy days. Delivery includes mounting bracket, support seatpost and saddle installation, convenient and quick, suitable for mountain bikes and road bikes. Specifications:Color: Red Material: ABS Light Source: LED Battery: Built-in 420mAh Lithium Battery Waterproof: IPX5 Item Size: 106 * 39 * 39mm/ 4.2 * 1.5 * 1.5in Package Size: 60 * 43 * 110mm/ 2.4 * 1.7 * 4.3in Package Weight: 76g/ 2.7oz Packing List:1 * Brake Tail Light 1 * USB Cable 1 * BracketPackage List1 * Brake Tail Light 1 * USB Cable 1 * Bracket