"Description: The high-end smart bike brake sensor light has taillights in six modes that automatically turn on at low brightness and turn off at high brightnessWhen braking, start up sensitively to ensure safety, and automatically switch to brake light mode when decelerating. IPX6 waterproof and dustproof, high-quality aluminum alloy body, durableWide Angle view of 180 degrees, visibility up to 150 meters, provides ultra-high brightness in all weather conditions USB rechargeable battery for up to 32 hours of extended operation including saddle/post mount base/strap - very convenient Description: The high-end smart bike brake sensor light has taillights in six modes that automatically turn on at low brightness and turn off at high brightnessWhen braking, start up sensitively to ensure safety, and automatically switch to brake light mode when decelerating. IPX6 waterproof and dustproof, high-quality aluminum alloy body, durableWide Angle view of 180 degrees, visibility up to 150 meters, provides ultra-high brightness in all weather conditions USB rechargeable battery for up to 32 hours of extended operation including saddle/post mount base/strap - very convenient Two opening modes: Manual power on: 7 light modes, long press for 3 seconds to power onAutomatic mode: 7 kinds of light modes, click on the power on, the daytime power on five seconds automatic shutdown Specifications: Package includes: 1 piece bicycle brake sensor lamp" "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."