Mitex 2 Wire Acoustic Tube Kit Mitex heavy duty 2 wire acoustic tube kit with covert mic and PTT Retains all the benefits of the 1 wire acoustic tube but with the added feature of a PTT that can be placed down the sleeve and attached to the finger for complete covert communication. Recommended for live events, theatre, stage crew, security, site management, office, retail, warehouse staff and all security applications.