Pro Trucker PTS2040 dynamic noise cancelling 20-watt external speaker with 6 power cord and 3.5mm plug attachment. The PTS2040 is considered the high end speaker in the PTS lineup. This speaker is great for CBers who are looking to keep cost down on a noise cancelling speaker with talk back, but still have a great speaker to receive communication on and have the talk back feature! The speaker offers easy install and at only 4.5" you can mount this nearly anywhere in your cab without any issue. Pro Trucker products are regarded as the best in class and they guarantee your overall satisfaction.