model : rollin piano ep-k37d relevant parameters : 1、pucker punction of electronic keyboard 2、37 standard keys 3、6 demonstration songs 4、8 tone colors 5、8 rhythms 6、4 drum sets 7、single finger chords/fingered chords/fill-in 8、one key one note 9、record /playback 10、16-stage volume adjustable 11、32-stage tempo speed 12、external phone output 13、external dc input 14、automatic shutdown function number of key: 37keys timbres: 8 demo songs: 6 rhythms: 8 percussions: 4 chord: single finger/fingered chords output power: >=0.5w rated voltage: dc4.5v