Casio SK-1 Portable 32 Key Sampling Keyboard Synthesizer Read Description.

The keyboard works great but couple things to note. The battery compartment has brown foam all in it. The battery compartment does not have corrosion though. Some of the keys have engravings in them as shown in the picture. Also one key is a little loose but it does work. It does sit fine when not touched but then you put pressure on the side of it will move easier than the other keys.