This is a CASIO mini keyboard. According to the manufacturer's website, it seems to be a hit product that has been sold for 20 years. It appears that MIDI can be used by connecting with a cable. I purchased it in 2011 and used it for practicing a cappella in a circle activity, but I haven't used it since then. GZ_5 Casio Price: ¥12800 The keys are small. Please refer to the manufacturer's website for detailed specifications. There is writing on the back, which has been erased with a black marker. Since it cannot be removed with alcohol, I will sell it as is. Thank you.