The ROCKBROS BL-S2 is a smart LED rear light designed to keep you visible and safe while riding road, mountain, or city bikes. It features a 400mAh battery that you can easily recharge via a USB Type-C port, ensuring you have power for your commutes. To help you manage your visibility, the light offers six different modes, ranging from a steady glow to various flashing patterns, all of which are operated through a simple touch control interface. This tail light is equipped with intelligent sensors that automate your safety; it includes auto brake sensing to alert drivers when you slow down and a vibration wake-up sensor that activates the light as soon as you start moving. A built-in light sensor further optimizes performance based on your surroundings. Built from durable plastics and rated IPX6 for water resistance, the device remains reliable during heavy rain. It attaches securely to your seat post using an elastic mounting bracket, making it a practical choice for cyclists who want a set-and-forget lighting solution.