-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, it’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 your convenience -Waterproof & Firm: The shell of the bike light is made of aluminum alloy, which is very strong and durable. This bike light set is waterproof, so you can use it when it rains. -Wide Application: This bike light can be used both indoors and outdoors, you can take it for night riding, camping, fishing, exploring, repairing and other outdoor activities.