Pro Tac SC Gold. Only Weighs 10.1 ounces. NRR is 25 – One of the most versatile hearing protection available on the market today. Battery life is up to 250 hours with normal use. 3.5mm input jacks for connecting phones & music devices. Chop cut cup for easy shouldering of long guns. Gold connectors for premium sound quality. Industry-leading attack time of 1.5 milliseconds. Automatic shut off after 4 hours of inactivity. 2 military grade circuit boards rather than the standard single circuit board for greater adjustability. Exclusive DLSC Compression Technology for improved situational awareness. 8 bit microprocessor controls self-diagnostics test, ensuring that the device works properly. Ultra-comfortable viscoelastic ears seals & padded, adjustable headband. 4 N (or 2 Lithium 123) Batteries Included. Made in the USA.