This is a Suikousha Suikou-100 sequencer, a shigin conductor. The case lid appears to be a speaker. Since there are no batteries, I haven't been able to confirm battery-powered operation or the speaker's functionality. I tested the unit with a non-original instrument AC adapter connected to a wall outlet, and confirmed its operation through the headphone output. It worked without any problems. It made various sounds, which was enjoyable. Only the items shown in the pictures are included in the sale. I will perform a basic cleaning before shipping.