Pro Ears - Pro Tac SC Gold - Military Grade Hearing Protection and Amplification - NRR 25 - Ear Muffs - Black Pro Tac SC Gold Series electronic hearing protection and amplification. Pro Tac SC has chop cut cup for easy shouldering. Audiophile sound Military grade dual circuit boards. Gold Connectors for high quality audiophile sound. Automatic shut off Weighs only 10.1 ounces. Fast attack time of 1.5 milliseconds. Includes 4 N size batteries