Motion and light sensors enable automatic on/off functions, conserving battery life. The light activates upon movement detection and turns off after 30 seconds of inactivity, ensuring visibility when needed without manual intervention. Choose from 5 light modes to tailor your visibility preferences during night rides. The high lumen COB LED technology enhances visibility, making you more noticeable on the road for added safety and peace of mind. Experience improved safety with the brake sensor that automatically switches to high-light mode upon braking. A bright 5-second warning light alerts drivers behind you, enhancing your visibility and reducing the risk of accidents. Easily adjust the brightness of the taillight by pressing and holding the button in always-on mode. The built-in 400 mAh lithium-ion battery offers up to 50 hours of continuous operation, with a convenient battery indicator displaying remaining capacity in 25 percent increments. Crafted from aluminum alloy, this bike tail light combines durability with a sleek design. Its IPX6 waterproof, dustproof, and shockproof features ensure reliable performance in various weather conditions. Description: Illuminate your way with the smart and efficient bicycle light. Featuring an automatic switch that conserves battery life, this taillight boasts a light sensor and motion sensor that intelligently turns off after 30 seconds of inactivity. Upon movement detection, the light instantly reignites, ensuring visibility during your ride. Choose from four light modes. The intelligent brake sensor enhances safety by activating a high-light mode when braking, alerting drivers behind you. Easily install using the metal bracket or adjustable silicone strap provided. Adjust the brightness to your preference with the built-in 400 mAh lithium-ion battery, offering up to 50 hours of continuous operation. Crafted with an aluminum housing, this IPX6 waterproof light is durable and reliable in any environment. Stay safe and visible on the road with this versatile and high-performance bicycle taillight. Item Name: Bicycle Light Material: Aluminum Shell Battery Capacity: 400mAh Features: Rechargeable, Easy to Install, Waterproof Size Details: L: 4cm/1.57", W: 3.4cm/1.34", H: 3.4cm/1.34" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bicycle Light 1 x Charging Cable 2 x Mounting Brackets