Using the Magic Shine Seemee 100 Lumen Rear Light is easy. First, use the easy mounting system to attach it to your bike. When you start riding, the ambient light sensor will adjust the brightness based on the light around you. When you brake, the motion sensor will activate to make you more visible. To save battery, you can switch to the low - power mode. When it comes to maintenance, keep it clean with a soft, dry cloth. Avoid exposing it to extreme heat or moisture. If the light stops working properly, check the battery and make sure it's properly installed.