Using the Magic Shine SeeMee30 Bicycle Lighting Set is simple. First, use the included O - Rings to attach the front light to your handlebars and the rear light to your seatpost. You can choose from 1 constant and 4 flash modes according to your needs. When riding in low - light areas, turn on the light to stay visible. For battery, it lasts 2 hours on the highest brightness. Once the battery level hits 5%, it'll switch to a power - saving flash mode that lasts 20 minutes. To charge the battery, just use the included Micro - USB cable. As for maintenance, keep the lights clean and dry. Avoid exposing them to extreme heat or cold. If you notice any damage, stop using the lights and get them checked.