Anyone own one? If you take the battery plate off, there's a black plate-like thing opposite to the sim card. If you take it off, there's a plug thing there. Any idea what it is? I've consulted the user's manual, but with no luck. Anyone have any idea what it is?

Peavey 5150, Squier, Ibanez RG2EX2, Yamaha F150, Ibanez RT150, MXR noisegate