The Pro Tac models are essentially the same as the traditional Pro Ears Gold and Pro Series models and have the same electronic technology. However, Pro Tac has been designed with Law Enforcement and Military Personnel in mind. We provide an option of “N” size battery or lithium 123a batteries – which are more commonly found in law enforcement and military service equipment. The cup emblem is grey and more subdued. The cup is slightly narrower at the bottom for the slim and mag models.