- Duolingo has unveiled a $249 portable piano - The startup Loog helped him develop the piano - The top panel has a stand for a smartphone. - The set also comes with note cards for learning notes. - The piano weighs 1.65 kg and is about 48 cm long. - It has built-in stereo speakers and a rechargeable battery. - The battery has enough power for eight hours of playtime - At the back, there are ports for a sustaining pedal and an octaver. - There are also headphone and USB-C jacks. - Duolingo music courses support other pianos as well