I think it is just how it is made. Normal shotguns do not have any normal-tele stuff.
As I understand it is just cheapest Chinese mike on ebay.
You can try to check MXL mikes. They are much better then cheap mikes, but still pretty affordable.
I recommend http://www.mxlmics.com/microphones/field-recording/FR-300/, they are present on ebay
http://www.ebay.com/itm/MXL-10-inch-Camcorder-Shotgun-Condenser-Microphone-Mic-/120829797963
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