Model number: NUX NEK-100 61 keys on the keyboard Light2, Light1, Normal, Hard1, Hard2 are the touch response options. 500 sounds; 54 maximum polyphony A4 tuning (420-460 Hz), Octave shift (-1 to 0 to +1 octave), dual voice, split keyboard, reverb (3 types), and five user presets are among the effects and functions. Sync Start, Auto Chord, Single/Multi Fingering, A/B Variations, Intro/Ending, and 100 Styles of Auto Accompaniment Pitch Bend Wheel: +2 semitones; Metronome: 1-9 Beats, 4 Voices, 40-240 BPM Tempo Range, Tap Tempo - 20 Live Music Songs - 100 Demo Songs - Live Music Function Connectivity: 3.5mm Stereo Phones Out, 6.35mm Stereo Aux Out, 3.5mm Stereo Aux In, Sustain Pedal Jack, USB MIDl, Bluetooth Audio, and Bluetooth MIDI – Display: TFT LCD 128X64dpi - Speakers: 5W X2, 2.2 x 4.9 x 2 - Power Source: DC or a 3000mAh rechargeable battery