Roland BK-3 BK Backing Keyboard, 61 velocity sensitive keys, 851 Sounds, 53 Drum Sets, 128 max. Polyphony, Whole, Split and Dual Mode, Digital Effects, LCD-Display 132 x 64 Pixel, 250 Styles, performance List unlimited number ( storage on USB memory ), Video, Real-Time-Player SMF (Format 0/1), KAR, mp3, WAV, Time Stretch Function for Mp3 and Wav, Save Energy Function, Connectors: MIDI: MIDI IN, MIDI OUT, Output/Headphone jack 6,3 mm, USB to Host (Midi), USB to device ( USB Stick), Sustain pedal jack, Speakersystem 2 x 7,5 Watt, Accessories Power supply, Owner's Manual and Musicrest, Dimensions in mm B x T x H: 1044 x 317 x 129, Weight: 7,5 kg, Color black