This LED bike tail light comes 2 in a pack of different colors. The silicone strap that is highly elastic allows for easy installation and removal anywhere suitable. You can install it at front, back or somewhere else suitable on bike for different purposes, you can also install it on helmet as a beacon at night.Once it's installed on, it clutches and stays firmly in place all the way on road regardless of the bumps. No worries about it falling out while driving. Each light contains 2 bright LEDs in lighting modes of steady-on, rapid flash and slow flash.You can conveniently switch between different modes at needed time with one button set for all operations.Highly elastic strap for easy DIY installation and removalSuits multiple positions for different purposesClutches firmly in place all the way on roadDurable silicone housing resists water and scratchesOne on/offBattery: CR2032 batteryLED Quantity: 2 LEDs*2Size: 1.57*1.18*1.18inch(LxWxH)Weight: 0.6oz*2colour: Black + redMaterial: Silica gelPackage Contents: 2 * LED Bike LightOnly the above package content, other products are not included.Note: Light 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.