Keyboard 44 mini-size keys maximum polyphony 8 tones 100 built-in tones rhythms/patterns 50 built-in patterns built-in songs 10 (song bank) lesson function melody on/off (lesson part: Melody part) other functions piano tone/organ tone one-touch button 5 drum pads tuning control a4 = approximately 440 hz ± 99 cents display screen lcd speakers 8cm x 2 amp output 0.8w＋0.8w input/output terminals headphones/output (3.5mm mini stereo jack) external power (9.5v dc) power requirements batteries: Aa-sizex6/optional ac adaptor: Ad-e95100l dimensions (w x d x h) 604 x 211 x 57mm excluding music stand, and other projections weight 1.4kg (excluding batteries) included accessories song book.