This is a USB keyboard, 25 keys as its name suggests. Features that interested me primarily are small size (it comes in a laptop bag) and prices unbeatable for a keyboard "classic" (the equivalent model Korg eg. Has a weird kind of pads instead of keys ... not for me!)
Level connectivity is there ne may be simpler: a USB mini-B f, mini-B/Type-A cable provided. One might regret the absence of connectivity for a pedal (-1).

UTILIZATION

I want to point out first that I bought this product as a complete beginner to the keyboard.
I use it to store parts, mainly composed of electro or when there is a playing hand. This should also use it perfectly.
The touch is quite good for the price, but it is still a bit "cheap" (-1). A drawback is precisely ... the size of the keys, a little tight when you got paws like shovels (-1)! But it's still playable, and that's the price to pay for a minimal footprint.
I did not read the manual, no need for basic functions, but I do not use any of the functions 'program'.
The Arpegiator is rudimentary but may be useful.

OVERALL OPINION

I use it for more than a year. In the same price range, I tried the Korg thing about it but I got my way.
Clearly, this is not a touch keyboard-heavy high-end, but you get for your money.

Most: the small size and price.
Minimum: the size of the keys.

I would do this choice without hesitation!