Earmark's 4S Headset Radio is a two-way portable radio built into noise reducing earmuffs. If you work in a high noise environment, the Earmark 4S Radio Headset makes you truly productive. The 4S provides the best combination of performance, durability,  and comfort available while giving you a substantial Noise Reduction Ratio (NRR) of 23, allowing you to communicate around high noise equipment like turbines, pumps, jet engines, and corrugators, everyday

Engineered to perform continuously, in tough industrial environments, Earmark's Series 4S Radio Headsets are state-of-the-art pieces of communications equipment. With earcups constructed of "T" grade ABS plastic and utilizing monobloc cup construction, the Series 4S stands up to rough handling. One 9 volt alkaline battery or an optional rechargeable NiCd battery provides enough battery life able to last more than one work shift. Also, the battery compartment is sealed against moisture and dust to reduce the chance of corrosion.

Comfort means a lot. We try hard to make you as comfortable as possible when you use Earmark radios. The Series 4S Headset features a Vertical Support Strap to distribute the weight evenly across the top of your head and a back strap to keep the Headset from falling off when you bend forward. The glass-filled Delrin headband pivots easily, changing the pressure points on the soft, hypo-allergenic earmuffs. By moving the headband you can vary the load over the course of a day. Earmuff covers help avoid perspiration problems and provide sanitary protection. Optional hard-hat mounts can be provided for areas that require use of hard hats.