This is a well built 88 keys keyboard piano, sounds GREAT, however I’m not an expert but it apears to be the most compact 88 key portable piano with actual moving keys.I primarily use it for cord shape exercises, but my oldest granddaughter really likes it.. I appreciate the engineering of it, includes the power supply..the black keys are not very high but for me they are fine. It’s very lightweight less than 10lbs.It has so many nice features one is that is foldable it comes with its own carrying case, so easy to store or take with you when traveling, also has built in wireless connection. Use Bluetooth to connect wirelessly with piano games apps such as Garage Band, Perfect Piano and Pop Piano, or online music lessons, Make piano learning more fun. Electric piano keyboard MIDI/USB interface allows you to connect computer and other intelligent devices to edit music and create your own music.this thing is going to be great for my granddaughter and even me recommended.