Name : REBOUND Combo Bicycle LED USB Rechargeable Head Light and back light with Tyre Valve Light Light Type : LED Type : Front Rear Light Combo Net Quantity (N) : 4 Multiple Light Modes : The bike light has 3 light modes: high brightness, med brightness, and flash/strobe. Press the ON/OFF button once to switch through the light mode and press it again for changing the mode. Bike rear light comes with 3 modes: Hight, Flash and Strobe mode. You can switch the light mode freely, which is very convenient. -Tool-free Installation: The installation of the bike light is very simple and can be installed and released on the bicycle without any tools. If you want to use it as a headlamp, you can connect the light with a headband. -Long Run Time: The bike headlight is powered by 800Mah rechargeable Li-Polymer battery, itrsquo;s easy to use and has long run time. The tail light is powered by rechargeable batteries (included) and is very safe and compact.. Charge them with usb cable provided at you