# Casio SK-1
“This vintage synthesizer sampling keyboard is in excellent working condition and comes in it’s original box with instructions. It does not have the AC adapter but it does run on 5 AA batteries. Functions include:
built in speaker, function selector, power indicator, mode selector, volume control
portamento on/off button, vibrato on/off, synthesizing button, envelope select button
tone selectors, tempo control, rhythm button, fill-in button, demo button
clear button, delete button, auto play, reset, one key play, sampling button
built-in microphone, loop set button, chord selector keys, envelope selector keys
rhythm selector keys, foot selector keys
The back panel has a line input terminal and a microphone input terminal; also an external power supply terminal and an output terminal.” Link