Using your Fender Mini '65 Twin Combo Guitar Amplifier is easy. First, you can either use the included 9V battery or connect a 9V adapter to the 9V adapter jack. Plug your guitar into the appropriate input. Adjust the gain, volume, and tone controls to get your desired sound. You can also use the 1/8' headphone jack for private practice. The tilt - back kickstand on the back allows you to angle the amp for better sound projection, and the belt clip is handy if you want to carry it around. When it comes to maintenance, keep the amp in a dry and clean place. Wipe it gently with a soft cloth. If you're not using the amp for a long time, remove the battery to prevent corrosion. And always make sure to turn off the amp when you're done using it.