Prism Tube - How To Use the Microphones and Speaker Sena September 19, 2018 23:34 Follow Have more questions? Submit a request 2 Comments Date Votes 0 RBEmerson October 04, 2016 19:27 Is it just my browser (Firefox - Win10) or are the videos missing? I searched YouTube for any Sena corporate videos and... nothing. What's happening here? 0 Sena Marketing October 04, 2016 23:54 We have fixed the issue. Article is closed for comments.