The manual mode and automatic mode can be switched. Press the on / off button for a long time, and press the button for a short time to switch the lighting mode.The normally on gear is in manual mode and is not controlled by the light sensing riding state,The other five gears are automatic mode: breath flash - slow flash - fast flash - rhythm flash - energy-saving flashUnder automatic mode, there is mutual control of light sense and vibration sense;In any mode, there is a brake warning function. When the brake is detected, the tail lamp enters the constant light mode with high brightness for 3 secondsBattery: 400mah lithium batteryCharging current: 280mACharging time: 2 hours and 20 minutes, standby time up to 1 year.Endurance time: normally on for 15h - breathing flash for 18h - slow flash for 25h - fast flash for 27h - rhythm flash for 27h - energy saving flash for 48HCharging indicator light: it flashes when charging and is always on when full;Power reminder function: short press the switch in the shutdown state, the power is more than 80%, and the green light is always on for 2 seconds; When the power is less than 20%, the green light flashes for 2 seconds; The power is 80% ~ 20%, and the green light flashes slowly for 2 seconds.When the tail light is on, the green light flashes quickly for 1 minute, which means the power is less than 20%Waterproof grade: ipx6 24 bright LEDsStyle: B StrapProduct size: 44 x 34mmMaterial:PC+aluminum alloycolour:BlackPackage Contents:1 * Tail lamp1 * charging cableOnly the above package content, other products are not included.Note: Light shooting 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.