Optional AC Adapter is not included.

Battery contacts are clean

All of the keys work.

This runs on 5 AA batteries or a power supply, not included. 

Main Features:

* 32 midsize keys

* 2 built-in speakers

* main voice polyphony 4 notes (only 3 with rhythm)

* 100 preset sounds divided into 5 groups with each 5 sounds and each 4 variants per sound selected by the "tone edit" button:

o keyboard {piano, elec piano, harpsichord, elec organ, celesta}

o wind {trumpet, brass ens, clarinet, flute, harmonica}

o string {strings ens, violin, cello, elec guitar, elec bass}

o synth {waw voice, bells, plunk extend, twinkle echo, jumping}

o s.e. {car horn, ambulance, airplane, telephone, chirp}

* 8 preset rhythms {8 beat, 16 beat, swing, slow rock, shuffle, march, samba, waltz} (without accompaniment}

* 8 preset rhythms with accompaniment {rock, pops, jazz, funk, house, country, latin, classical} (fixed- key, thus of little use)

* 8 "funny" accompaniments {fanfare, hopper, computer sound, horror, child's play, orient, jungle, comedy}

* preset sounds & rhythms selected through multiple presses of group buttons

* volume +/- buttons (5 steps, reduce bit resolution badly)

* tempo +/- buttons (16 steps)

* wavetable sound generator with sounds based 2 mixed low- res loop samples with independent, partly very complex algorithmic volume and pitch envelopes.

* CPU "OKI M6387-16, 3332316" (30 narrow pin DIL)

* crystal clocked

* 10 demo melodies song bank (wonderful complex polyphonic orchestrations)

* lesson function (to learn playing the demo melodies)

* jacks for AC- adapter & headphone