Yes — that's the whole idea. The keys light up to show where to press, so there's nothing to read and nothing to explain. Kids follow the glow with one finger and hear a melody come out.
None. Press the power button and the keys light up — it's ready to play straight out of the box.
Yes, there are three light modes — full glow, gradient and single-key — switched with the chunky buttons along the top edge.
Very. It's pocket-sized — about the size of a large pencil case — and the braided carry strap makes it easy for kids to bring along themselves.