These won't make you sound like Darth Vader...but you can try
 
Very useful piece of kit!
 
Long gone are the days where you need to chaotically mime to your buddy about an incoming Sarin attack (almost got us there, unnamed Syrian Dictator!); now you can make sure you're well heard in any condition that requires a (CAF issued) gasmask!
 
Grab yours here! 
 
*The PC4 and C4 voice emitters are not interchangeable. The PC4, issued to Police, and the C4, issued to Canadian troops, are two separate systems. Only by the voice emitter for your specific mask.