FIRST: IT DOES COME WITH ITS OWN AC ADAPTER.So, I'm just one step above a beginner. I've had some music training but am not a performer. I just needed a good portable keyboard that wasn't a little kid's toy. This is NOT a toy. Mind you, it's not a professional unit worth thousands of dollars. But if you're like me, you do not need that kind of a pricey keyboard. If you just need one that you can keep handy to get in as much practice in as possible (and with MIDI capability), this might just be as perfect for you as it is for me.The construction is wonderful. Even the keys have a very nice tactile feel: not shiny, but a smooth texture. Other small details are the copy stand which is a great design, slipping nicely into the handle opening; it is not a flimsy, thin plastic type like most. This copy stand has some substance to it, it is not bendable. And even the surface where the bottom of the pages sit has some grooves in it to keep them from slipping around; those are the kind of details this keyboard has.Performance-wise, the speakers are excellent; great volume and quality. The feel of the keys are not weighted, but they're not described as such. They feel like an electronic keyboard, with some bounce, but easy to get used to. Again, if you're just using for practice, they are fine. They're comfortable. And they are full size piano keys.The number of tones?! Holy cow. There really are 400! Haven’t heard all of them yet! lol But the ones I have heard sound great.And it is easily attached to a USB port for MIDI use. What I loved about it is that you can leave the audio on and connect to your DAW for MIDI at the same time, using audio from either or both, computer or keyboard speakers. THE MICRO-B/USB CABLE IS NOT INCLUDED. However, they are very inexpensive. I just bought a package of 3 different sizes for less than $10.And this keyboard has a handle!!! LOL I especially wanted one that I could carry around the house, when the whim hit me, to noodle around on the ivories, and just get better at it.I've gone through several keyboards, trying and sending each back. I was beginning to think I would never find the perfect one. But this one is the perfect one for me! Great quality. Easy to carry around. And reasonable price.Oh, one thing more: It is hard to find a keyboard like this that isn't clogged up with controls along the top, making it extra deep, front to back. This one has a nicely trimmed console along the top of the keys, so that, proportionally, the length of the keys make up about 3/5 of the depth of the keyboard. I love that. This thing is mostly just 61 full-size piano keys.PS: I only received it today, so haven’t even begun to learn all of its features. It has so many.