Product Features 1.Brake I Light sense Vibration sensing Windbreaker Magnetic Smart Tail Light 2.Dormant while resting Light sense self-starting 3.No fear of rain Life waterproof 4.Magnetic installation Stable and reliable 5.Smart light sense Windbreaker magnetic tail light 6.7 Lighting Modes / Brake Sensing / Day & Night Light Sensing / Smart Start & Stop When the brake is sensed Highlight lasts for 1.5s Normal riding Regular mode Intelligent brake sensing When the speed is detected to be significantly reduced, thelights will immediately switch to the highlighted stateand remain for about 1.5s to warn the rear vehicle Dormant while restingLight sense self-starting In automatic modeWhen the ambient light is sufficient(Such as in the scorching sum)or when the bike is parked andstationary for 2minutes,thetaillights automatically sleep In automatic modeAutomatically wake up the taillightswhen the ambient light is insufficient(Such as in a tumnel)or when vibrationis detected,and guickly hit the road