Ok, here’s an interesting boombox for you. The Sanyo KBX-7, as you can see, came with a keyboard. Not only that but the keyboard is detachable and wireless as well. It will play either attached to the boombox or detached.
Sanyo called it the Portable Stereo System With Synthesizer Keyboard. When you push the boombox handle down the keyboard will pop out. Place the keyboard back in its spot and pull the handle up and it will lock in. It’s very difficult to find these with functioning wireless. The speakers are detachable as well. It has a line in that will work with an iPod as well as four radio bands AM, FM, SW1, and SW2. The keyboard operates on 5 AA batteries.
One of these boomboxes sold for $223.00 in average condition and a functional cassette. The keyboard worked when attached to the boombox but not in wireless mode when detached.