UPGRADED BRAKE SENSING：Activates a brake light when you slow downOnce deceleration is detected, Increases the brightness to ultrabright for 3 seconds, alerting and improving the reaction time of the person in any vehicle traveling behind. 5 MODES FOR ANY SITUATION：Press Button to Start up: (1) Half Light - 14 hr,(2) Full Light - 7.5 hr, (3)Breathing Flash - 14.5 hr, (4)Slow Flash - 28 hr, (5)High Flash -17 hr. Double-Click Button in any mode to open the High Flash mode. Long press Button to turn off the lights in any mode, next turn on will keep the mode. LIGHT & REFLECTOR 2-IN-1：Super bright LEDs provide excellent long distance and 220 degree visibility, up to 120 lm. Also has highly reflective reflector meeting CPSC regulatory compliance to build the double safety system. 2 INSTALLATION CHOICES： Effortlessly install with high-end bracket under-seat or rubber band seat post mounts. Fits most bike, like road, mountain, cruiser, scooter.Passed strict shock-proof and drop testing,IPX6 water proof for diverse riding conditions day and night. HIGH-PERFORMANCE POWER SYSTEM： Stay powered during your rides with the 400mAh Li-ion battery. On 1.5 hr Type-C safe charge, enjoy up to 28 hours of usage（Slow Flash）. The built-in power indicator features make red flash to ensure you know when to recharge. GREAT GIFT CHOICE ：Surprise your cycling loved ones this holiday season! Our bike lights make the perfect gift for friends, kids, partners, or spouses who love night rides. Give the gift of visibility – order now for Christmas, Valentine's Day, or Thanksgiving adventures! bike light