Using the NiteRider Omega 300 tail light is easy. First, charge it via USB. Once charged, use the quick - release tab on the seat - post strap mount to attach it to your seat post. It's designed specifically for this type of mount, so no back - clip is included. When riding, you can switch to the Daylight Visible Flash (DVF) mode during the day for maximum visibility. In group rides, use the Group Ride Mode to stay visible without disturbing others. As for maintenance, keep it clean. Since it's IP64 dust and water - resistant, a quick wipe down is usually enough after a ride. Avoid exposing it to extreme temperatures. Also, if you notice the light is dimming, it's time to recharge it.