The ROCKBROS WR05 is a smart brake-sensing tail light designed to increase your visibility and safety while cycling. It features a 180° wide-angle beam with a brightness of 100 lumens, ensuring you are seen from various angles. To help you manage your ride, the light offers seven different modes, including high, medium, low, breathing, and flashing options. Integrated sensors make the device intuitive, as it automatically switches to its brightest mode when you brake and turns itself on or off based on the surrounding ambient light. This system is powered by a rechargeable 500mAh Li-ion battery via USB, with a slow flash indicator to let you know when the power is running low. Constructed from a lightweight black ABS plastic shell, the unit weighs only 50g and is water-resistant to handle rainy conditions. You can easily attach it to your seat post or saddle rail without needing any tools, making it a practical choice for commuters and long-distance riders who want a reliable, automated safety light.