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Studio Projects B1 microphone question

I ordered a Studio Projects B1 microphone off of eBay and I got it today. All the pictures I have seen of them show the mic just plain with no dials or switches on the front but this mic says Studio Projects B1 and then it has a switch on the front that can either select: -, -10dB, or -20dB. Then on the back it says CE and has another switch with options that are: -, 75, and 150. Does anyone else have this on their B1 or have you heard of this or what they do? Is this the wrong mic or something? Any help would be great so if I have to return it, I can. Thanks.