"Description: The high-end smart bicycle brake sensor light has seven modes of taillights, which are automatically turned on at low brightness and automatically turned off at high brightness. It starts sensitively when braking to ensure safety, and automatically switches to the brake light mode when decelerating. IPX6 waterproof and dustproof, high-quality aluminum alloy body, durable 180-degree wide-angle field of view, visibility up to 150 meters, can provide ultra-high brightness in any weather conditions The USB rechargeable battery can support up to 32 hours of extended operation, including saddle/post base/shoulder strap-very convenient Description: The high-end smart bicycle brake sensor light has six modes of taillights, which are automatically turned on at low brightness and automatically turned off at high brightness.It starts sensitively when braking to ensure safety, and automatically switches to the brake light mode when decelerating. IPX6 waterproof and dustproof, high-quality aluminum alloy body, durable 180-degree wide-angle field of view, visibility up to 150 meters, can provide ultra-high brightness in any weather conditions The USB rechargeable battery can support up to 32 hours of extended operation, including saddle/post base/shoulder strap-very convenient Two ways to open: Manual boot: 7 light modes, long press for 3 seconds to bootAuto mode: 7 light modes, click to turn on, and it will automatically turn off after 5 seconds during the day. Specification: Package includes: 1 piece of bicycle brake sensor light" "all Products From Us Have Undergone Strict Quality Checks. if There Is Any Quality Problem Or You Are Not Satisfied With The Product contact Us. We will reply within 24 hours. we Will Give You The Best Solution."