The cover simply pops off by pulling on it. I don't need power at the moment, but might down the line. I'm a ham, and though I don't really want to put an antenna on the car, I might end up wanting a radio worse. One of those "30A" terminals might work for that as long as there's no noise induced. I also wouldn't mind having a constant-power accessory port (either by adding one, or powering an existing one with constant 12VDC).