Feature:1. IPX-4 daily grade, can be used even in rainy days, no need to worry about product soaking.2. Multihole straps, can change size with the size of the seatpost, suitable for all riding models.3. Seven flash modes, can change the flash mode freely, constant light, fast flash, reverse flash, slow flash, clockwise, changing flash, windmill flash.4. Easy to install and use, increase night riding safety.5. Wonderful mountain bicycle riding equipment.Spec:Condition: 100% brand newItem type: Bike TaillightMaterial: PC plastic + rubberProduct Color: blackLight color: colorfulWeight: Approx. 60g Light Luminous flux: 40 lmWaterproof level: daily waterproofBattery type: polymer lithium batteryBattery capacity: 500mAh lithium batteryFlash mode: 7 typesSwitch machine: long press the red button switch on the backPackage List:1 x Taillight1 x Taillight card buckle1 x Taillight fixing belt1 x Data cable