hi I would like to ask if u can back spin with cd player CDI-500 MP3 ......and btw do u know if the power supply is 110v/220v switchable??? thank you so much for help

hi,
back-spin???like if using vinyl and by hand spin it backwards till it stops, yeah it can do that and plus it has a reverse feature which is cool. When playing, press reverse button and it'll play the track in reverse. Great for listening hidden messages in tracks!