Startone BK-54, Keyboard, 54 Keys, 300 Voices, 300 Styles, 50 Songs, LED display, Metronome, Sustain, Vibrato, Keyboard Split, Transpose, Headphone jack: 3.5 mm jack, Microphone connection: 3.5 mm jack, Speaker: 2 x 3 Watts, Battery operation possible with 6 x AA V batteries (not included), Dimensions (W x D x H): 830 x 330 x 85 mm, Weight: 3 kg, Incl. power supply and music stand