hi -korg sp 250 88 weighted key piano /88-key Real Weighted Hammer Action 3 keyboardTouch control: Light, Normal, HeavySound generation: Stereo sampling system60-note polyphony30 sounds (5 pianos, 7 electric pianos, harpsichord, 2 clavs, vibraphone, marimba, acoustic guitar, 3 jazz organs, 3 church organs, 3 strings, 3 choirs)2 programs can be layeredReverb and chorus effects (3 layers each)30 demo songsMetronome: Tempo, Time Signature, Accent, and Volume controlsTuning: Key Transpose, Fine Tuning, Temperament (Equal, Kirnberger, Werkmeister) 2 x 11W amp2 - 10 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// Hi all the keys are working as the should and the functions change as they should //no problems detected/plays and sounds great- but thats the extent of the testing //sold as described //comes with a power supply and music stand /but piano stand is not included.will ship fedex ground home delivery insured or pick it up yourself -any questions feel free.