Using this D'Addario Nexxus 360 tuner is easy. First, clip it onto the headstock of your guitar. You can rotate it 360 degrees to find the best viewing angle. When it's time to charge, use the provided USB - B charging cable and plug it into any USB power device. Each charge gives you 24 hours of tuning time. Keep the tuner clean by gently wiping it with a soft cloth. Avoid exposing it to extreme heat or cold, as this could affect its performance. If you have any questions, refer to the included manual.