BX-II 88-key Portable Digital Piano with Bluetooth & MP3. Sensitive Keys and Dynamical Adjustment: The digital piano features 88 fully keys (exquisitely according to 1:1 piano key ratio) and is heavier in the low end and lighter in the high end, which can give you the feel of an acoustic piano and provide a wonderful playing experience! Dynamical adjustment is easy to implement when you long-press the transpose+ button. Thus, different dynamics will present unique piano pieces. Multiple Connections and Functions: MIDI/USB interface makes it possible to connect the computer and other intelligent devices to obtain a better training experience. 128 Rhythms, 128 tones and 20 demos allow you to ...