This LK165 keyboard comes with everything you need right out of the box. It includes a pair of headphones, X-style stand, and power supply. The Casio LK165 61 Lighted USB Keyboard with power supply is a great portable keyboard for beginners and experienced players alike. The full size keys light up as you are playing, up to four keys light up at a time. The Casio LK165 is portable, so you can take it with you when you"re on the go. The LK-165 allows you to select from 400 tones and 150 versatile rhythms to help add plenty of life to all your keyboard performances. The Auto Accompaniment will allow you to simply play a chord and the corresponding rhythm, bass and chord parts play automatically. This keyboard also includes the 3-Step Lesson System that lets you practice at your own pace. The keyboard automatically grades your performances, so you can trace your progress as you improve. With a total of 110 built-in Song Bank tunes you have a broad range of music for your playback enjoyment or for play along practice. The LK165 may be powered by 6 AA batteries or the included power supply. Keyboard: 61keys Keyboard size: Piano type standard size keys Key Light System: Up to 4 keys can be lit at the same time Sound Source: AHL Maximum Polyphony: 48 MIDI: GM Level 1 compliant Key Transpose: +/-1 octave, -12 to 0 to +12 semitones Tuning Control: A4 = 415.5 - 440.0 - 465.9 Hz Number of built in tones: 400 Stereo sampling piano tone: Yes Sampling function: Maximum recording time 1 second, Maximum 3 sampled tones Reverb: 10 types Number of rhythms: 150 Number of one touch preset: 150 Number of built-in songs: 110 songs including 20 practice songs Step up lesson: Yes Metronome: 0, 2, 3, 4, 5, 6 beats Adjustable tempo: From 30 to 255 Number of demonstration song: 90 songs, loop play back except practice songs Auto start demonstration: Yes Pads: 5 pads x 4 sets LCD size: 92 millimeters x 40 millimeters I con: Common I con design USB port: To host MIC IN jack: Yes SUSTAIN JACK: Yes PHONES OUTPUT jack: Yes DC IN jack: 9.5 Volt Speaker size: 10 centimeters x 2 Speaker output: 2W + 2W Power: DC 9.5 Volt, 6 AA size batteries Included Accessories: AC Adapter: Yes Music book: Yes