Due to waterproof design, it is windproof and rainproof. It is suitable for mountain bikes with an inner diameter of 19.2-20mm. It is suitable for road bicycles with an inner diameter of 21mm. Press long for 3 seconds and the red and white lights are on. Press again and the yellow light flashes. Press again and the yellow light is off. Press long for three seconds and the light is off. Battery: 350mAh 14500 battery Charging time: 1-2 hours, overcharge protection LED brightness: 28LM Use time: constant brightness for 9h Colour:black Material:ABS+PC Package Contents: 1 pair x Bicycle Bar End Plugs Indicator Lights Only the above package content, other products are not included. Note: Light reflection 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.