Features 1、The accurate sensing algorithm avoids the influence of installation position and angle, with accurate sensing and reduced misjudgment. 2、Brake sensing function, when the brake is detected, the taillights will be highlighted. 3、Equipped with two types of mounting bases, which can be installed on saddles or seatpole. 4、USB rechargeable design, you don't need to worry its battery. 5、IPX4 daily waterproof, can also be used on rainy days. 6、The taillights have gear memory function, so there is no need to switch modes in sequence for adjustment when used again. 7、In intelligent mode, the built-in ambient light sensor constantly monitors the surrounding ambient light. It automatically lightsup in low light and turns off in high light, allowing you to enter tunnels or caves without being distracted by operating the taillights. 8、In intelligent mode, it will automatically enter sleep mode after being idle for 90 seconds, and will wakeup automatically when a vibrations is detected. 9、Small size and light weight, no burden for riding. Type: Red 4 modes, Colorful 8 modes (optional) Material: aluminum alloy+PC Battery: 3.7V, 400mAh Waterproof: IPX4 Item size: 43 * 43 * 22mm / 1.7 * 1.7 * 0.9in Item weight: 38g / 1.3ounce Package size: 118 * 83 * 47mm / 4.6 * 3.3 * 1.9in Package weight: 100g / 3.5ounce Package List 1 * Light 2 * Bracket 2 * Fixing Belts 1 * USB Cable