Feature: ['Sound generating system: 2 VCO (square wave, triangle wave, sawtooth wave), 1 VCF, 1 EG, 1 LFO, 1 VCAKeyboard: 25 keys (slim keyboard, velocity sensitive, E-to-E configuration)Input/Output: Headphone jack, OUTPUT jack, AUDIO IN jack, SYNC IN and OUT jacks, MIDI IN and OUT connectors, USB B connectorPower supply: 6 x AA batteries (alkaline or nickel-metal hydride) or AC adapter (DC 9V)Power consumption: 2.5WIncluded items: 6 x AA alkaline batteries, Precautions Sheet, Quick Start Guide'] (Page 1)