The RadioShack / Realistic Pro-22 has 6 fixed channels, determined by crystals.
From the RadioShack manual:
The PRO-22 is a ruggedly built electronic unit, with all parts conservatively rated. However, you should treat it with care; don't subject it to excessively rough handling. You will find it will give you long life if kept free from dirt and excessive humidity.
Estimating the value of a rig can be challenging. We collect prices paid by real hams over the years to help you estimate the value of a used RadioShack / Realistic Pro-22. Just bought or sold this model? Let us know what you traded it for and help other ham operators!
These estimates are based on the following prices: