H42 Behind the Head (BTH) Headset for 2-Way Radios lends itself to uses ranging from auto racing to heavy equipment operation. Its design offers, 2-way communication via 2-way radios and intercom systems. Key features include a DNC microphone for clear transmissions, Clear Hear speakers for enhanced audio performance, and durability in extreme noise environments. It also has a molded ear dome, 3.5mm input jack for music and scanners, over the head Velcro strap, red M1 mic with wire boom, push to talk with a waterproof cover, foam mic muff, and a 5-pin universal radio port. Other noteworthy features are durable ear seals, a stainless steel headband, convenient volume controls, and high bend test cabling. In addition, it can connect to 2-way radios and intercoms with specific cords. It's compatible with various racing and intercom systems, but cords are sold separately.