WK-400 is designed for learning in piano classrooms and for any aspiring pianist. FEATURES - More than an Average Digital Piano - The WK-400 comes with all the essential functions an average digital piano should have. Finding the best keyboards was always the most headache problem. - So, here comes the problem solver: self-invented full-weighted, hammer-action keyboard assembly. - Play Loud or Keep It Private - Learning piano is all about practice; practice makes perfect. When it comes to piano class, it's important to keep one student from distributing others. Just hook up your earphone and make your practice private. Want to share your performance with others? The built-in stereo loudspeakers can deliver your passionate playing in real-time. - Inexpensive Productive Tool - You're getting more than just a digital piano but also a MIDI keyboard controller. The WK-400 features USB-MIDI, just connect it to your PC/Mac, use your favorite DAW to turn it into productive MIDI Keyboard controller.