Using your Topeak Soundlite is easy. First, mount it on your bike's handlebar. The handlebar mount fits diameters from 25.4 to 33 mm. To turn on the light or sound, use the wireless sound controller. You can choose from 3 different modes - 4 hours of constant light or 30 hours of blinking light, and also enjoy 4 distinct horn sounds. When the battery runs low, simply recharge it using the micro - USB cable connected to your computer. It takes about 4 - 5 hours to fully charge. For maintenance, keep the light and horn clean. Avoid exposing it to extreme heat or moisture. If you have any problems, contact Topeak's customer service.