recording - Yamaha PSR 2100

by Nathan
(New York, USA)

My nephew has a PSR 2100. I need to get for him an attachment that will record his playing. What is the best I can get for him? Tape cd USB etc. Please respond to my e-mail address nycrc21@aol.com.
I appreciate this very much. I'm sure you'll have questions & I'll try my best to answer
Thanking you all in advance.
Nathan