According to Correctional Service Canada National List of Personal Property for Men and Women Inmates can have 1 - One piece stereo system (100 W total permitted but no condenser microphones, microphones, shortwave capability, or detachable speakers permitted)

CD Boom Box with AM / FM Radio is compact and made with simplicity in mind. This boombox can be plugged into a wall outlet or powered by 6 C batteries (not included) so you can listen to your favorite CDs. (or similar)