Pro Tac SC gold green, lithium 123 batt features: – Worn by more shooting Champions than all other brands combined – Chop-side cup improves sighting without scratching your stock – ideal cup shape for snipers or those on surveillance – More comfortable than custom fit earplugs – Apple iPod, CD, motor sports scanner or radio compatible using a 3.5 mm mini jack. Enjoy high fidelity Sound while protecting your hearing – Natural replication of amplified sound – so comfortable you won’t mind wearing these earmuffs all day – the reliability gives you the confidence to do your best – Dark green – Weight: 10 oz – Made in USA The difference between Pro Tac and the regular gold models are: – include 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 – cup is slightly narrower at the bottom for the slim and mag models. Earmuffs are ultra-comfortable Visco-elastic ear seals and a padded Adjustable headband Hearing Amplification: Adjust your hearing and amplification to make up for uneven hearing loss with the dual knob system.