I contacted the seller. This is what he had to say:

"Hi there,

The receiver itself is single conversion. : )

The range of the receiver you have received is 500m which is same as the one in the pictures. : )"

Is 500M enough range? Can I use dual conversion crystals in a single conversion Rx? Also, what about high band and low band? I want to use a 30 and 46 crystal.

The receiver comes from Hong Kong and has the name "TurBORIX" on it