Features： Ideally suited to master finger control this portable piano keyboard allows for play of single-fingered and fingered auto-bass chords with the capacity to select chord timbre program/edit rhythm as well as utilize effects such as vibrato sustain & ensemble. Additional features include rhythm sync and fill-in tempo adjustment accompanying volume and a master volume control. Built-in speakers offer tremendous sound complete with 350 Timbres 350 rhythms 61 keyboard percussions.Stereo outputs and a headphone jack can be used to listen through external speakers or with the included headphones. Specifications: 36 white keys 25 black keys 350 voices and 350 rhythms With microphone headset With stand and bench Outer box size: 87.5 * 39 * 29.5cm (34.4 * 15.4 * 11.6in) Gross weight: 10.75kg/23.7lb Net weight: 7.05kg/15.6lb Electronic organ size: 83.5 * 27.5 * 8cm(32.9 * 10.8 * 3.15in) Power cord length: 181.5cm Stool sponge thickness is about 5.7cm There is a battery box at the bottom of the piano which can hold 6 AA batteries (You need your own battery)