If you're a beginner don't take this review too harshly, but I personally really don't like this keyboard.It looks good and is built pretty well, as in, I don't know how long it will last but it does feel pretty solid. It's also very portable and relatively lightweight. My problem with it is the sound but mostly the lack of true touch sensitive keys (sometimes called velocity sensitive keys). This means whenever you press a key, it sounds loud, even if you touch the key softly. This is pretty bad, you can't play with any softness or finesse. It's advertised as having touch sensitive keys, and it is technically true that if you press the key extremely, stupidly soft it will be a bit quieter, but it's not practical. Even then it doesn't really sound like a piano being played softly, it sounds like someone banging on a piano key but someone turned down the volume. Also the default piano sounds on this do not sound great either, and I would highly recommend using decent headphones with this keyboard. Honestly all this shouldn't concern you too much if you're a beginner. The fact that this comes with a sustain pedal is a huge bonus, not many keyboards in this price range have that. That's all I guess.It's feels solid, the keys feel okay (not weighted keys by the way, but they do have springs in them which give them a little resistance which some people like), but the piano sound is a little electronic-y and fake. It's not the worst sound though and I think it's fine for someone just starting if you're not too picky. The lack of true touch sensitivity is the worst part about it.Absolutely not touch sensitive AT ALL. If you play softly the volume of the note is quieter but still sounds like a note being hit as hard as possible. The sound quality is subpar and if you have sensitive ears it WILL give you a headache. Also the Bluetooth capability is non-existent. You can only connect to an app (that doesn’t really operate at all) so if you think you’re going to hook up to a Bluetooth speaker/monitor you won’t be able to. Also there are 120 different sound settings which is neat but the sustain pedal is only compatible with the first 2. The sustain pedal will only glitch out the other 118 presets. It isn’t bad for learning theory and scales so for beginners it’s fine. But if you have even a novice understanding of the instrument this product and probably other products from this company will frustrate you and probably just make you angry.It is hard to believe the even five five star reviews -- none of course which mention midi, bluetooth or sophisticated use beyond "my kid / friend/ i am using this to learn piano and it works" kind of reviews. There seem to be a dozen different companies selling variations on the core "BX-11" digital piano - all with the same flaws and limitations - some of which this version i bought Sept 19 2021 fixes. what good are are 127 tones (including "gun shot") when you have to toggle your way through them one at a time with a nasty BLEEP for each step? At least this version of the device (unlike every video you will see on youtube) actually has an LED counter so you know which one you are hearing. Something this stupid is unforgivable.But the bluetooth does work to the extent i could test it for 15 minutes. I bet the USB interface works, and the bluetooth-over-USB is probably class compliant, but that they don't claim this is a concern...I was on the verge of keeping this, and then returning it, and then keeping it -- until I found an F# key that made no noice whatsoever. Poor quality assurance. I have invested two hours, and this is the last disappointment. I will return it. Before you buy, watch the youtube videos; wait for one to show a happy, working BX-11 by any name before you buy one. No surprise there are none yet.At first, I was very hesitate to purchase this but boy am I glad did! I been looking for a light weight portable piano to carry around to practice with. Others that I been looking at is either too heavy, the sound quality is awful, the keys feels cheap and are not an acoustic piano size. I was really losing hope that there was such a thing.The Costzon BX-II 61-Key Portable piano fits all of my needs. The price is great! it looks and feels expensive. I love how they give you a carrying case. The only thing I wish that it has is an attach music stand, but that's not a deal breaker for me. The speaker sound isn't the greatest but its not horrible compare to other in this size. it is doable for beginner or to practice with. I have not try to attach a better speaker to it but I'm sure it would sound great!The SONART electric piano wasn't what I was hoping for. The instrument automatically shuts itself off after about 15 minutes. I bought it for use as a Finale data entry device. The data entry is sporatic. Sometimes it works, most times not. Achieving playback is a challenge also. It has been very disappointing thus far. I should have spent a little more money on a keyboard that had Midi In/Midi Out ports.Had keyboard for 6 weeks when the keyboard completely stopped sending notes thru it's headphone jack, cannot use headphones. Also the touch sensitivity isn't very good. Unfortunately only 30 day warranty included. A quality keyboard does not break after a few weeks of use. Very annoying. I have to drastically reduce my practice time to when no one's around.Para el costo del instrumento es una excelente inversión ya que por supuesto hay mejores pianos, pero a razón de calidad precio para principiantes esta excelente.I love this keyboard!!! The on board sounds ok! It’s a rechargeable keyboard and I can wirelessly use my amazing apps from iPhone. I can work on my songs and church repertoire anywhere Privately without needing electricity. I can do gig and events without needing Excessive wires and camera kits.Muy completo