Here's a great, vintage and versatile Yamaha VSS-30 keyboard and sampler.  This one is fully functional and clean but is missing the battery door.  It includes a non-original power supply for hours of sampling fun.

Here are the specs:
Company: Yamaha Corp.
Model: VSS-30
Class: Toy sampler
keyboard: 32 mini keys
Dates: 1987
Country: Japan
Weight: 1 Kg
Dimensions: 467 (w) x 180.4 (h) x 57,4 (d) mm
Speaker: 8 cm / 4 Ohm
Amplifier: 1,5 W RMS

Synthesis: sampler
Resolution: 8 bits
Polyphony: 4 notes
Presets: 11 sounds
Memory: 3,5 s sampling
Frequency: 16 / 9 kHz
Sequencer: 500 notes
Resolution: 1/48
LFO: 1 modulator
Envelope: 1 EG
Main IC: YM2416
Filter: none
PSU: 9V DC 9V with center negative (original model is PA-1 or PA-1B) or use 5X 1,5V batteries.