Ax-Synth is a professional synthesizer/keytar, used by famous performers like Lady Gaga, Black Eyes Peas and much more. I personally used this one 2 times on a stage and a few times at home. I am giving it away together with a case(not specialised for it but it fits), a stand and a power supply. You can find loads of information about it on the internet and even youtube!  Heres a few: https://www.roland.com/global/products/ax-synth/ https://ru.m.wikipedia.org/wiki/Roland_AX-Synth https://m.youtube.com/watch?v=MmWkbMH_Pf4