1>54 Key Musical Instrument 2>Microphone jack 3>suitable to kids 4>Guide A ... panel drum Functionsustain,vibrato,transpose,metronome,rhythm programming,32-level metronome control,16-level volume control RecordB/W key record,play,rhythm ... ,finger chord,low chord,chord open/clearVolume Control8-level rhythm volume control,16-level chord volume control Teachingguide A,guide BOuter Size850 ...