High-tech headphones take noise out of sound - The Globe and Mail
Review: Blackbox I10 Noise-Cancelling Earphones
Blackbox™ C20 noise-cancelling earphones – The ideal earphone for commuters, world-travellers or those who just want to hear the music. - Napthine Porter
Review] Blackbox C20 Active Noise Cancelling Earphones - NZ TechBlog