Equipped with a loud 110dB alarm, this bicycle tail light deters thieves effectively. The remote control function allows you to activate or deactivate the alarm from a distance. This tail light is USB rechargeable, providing long-lasting performance on a single charge. Our smart tail light comes with an advanced brake sensor that automatically increases brightness when , enhancing visibility and safety during rides. Designed for bicycles but also ideal for motorcycles, this multi-functional tail light ensures you stay safe and visible on all your adventures. Waterproof Level:iP65 Host Battery: 3.7V700mAh lithium battery, working time about 1-3 months, standby time about 6 months Remote control battery:CR2032(3V) Button battery, working time about 2-4 years (5 tímes per day) Working Frequency: 433.92MHz Working Environment Temperature: -40 ℃- +70 ℃ Working Environment Humidity: Less than 80% Storage Temperature:-40℃-+70℃ Colour:Black Material:ABS Package Contents: 1 x SF33R taillight 1 x 11C remote control 1 x handlebar bracket 1 x cable tie 1 x USB charging cable 1 pack x screws 1 x remote control bracket 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.