The front panel of the mid tower case shown above has two external 3.5-inch drive expansion bays, and four 5.25-inch drive expansion bays. Most front panels have an on/off switch, as well as a reset switch that is used in cases where the computer locks up and won't respond. Most front panels also have a power on indicator light and at least one hard drive activity light. Case speakers are often located just behind the front panel. Some front panels also have USB, audio, and other easy to reach port connections.