What a Joke !
It is a Medeli keyboard (low-budget) with a Kurzweil mark .

http://allegro.pl/88-klawiszy-piano-pianino-elektryczne-sp5500-usb-i4603258668.html

http://www.muzykuj.com/aktualnosci/artis-7-oraz-keyboard-kurzweil-ka-110,1112.html

Impuls
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Genos2,Yamaha YC61, Ventilator2 . : https://www.youtube.com/channel/UCmC6hdAR1v5lYN8twfn0YbA