David Clark 40461G-15 Model H6240-M PTT Equipped Behind the Head Radio Direct Headset Requires the appropriate C6200 Series Modular Radio Adapter to connect to your Radio! David Clark rugged durability and reliability Certified NRR: 23 dB (noise attenuation) PTT button conveniently located on headset ear dome Undercut, Comfort Gel/Foam Ear Seals for maximum comfort Water-resistant mic protector held securely in place with zip-tie windscreen cover Wear with or without hard hats and helmets Improved 20-20kHz earphone New Stronger Over-Molded Boom Assembly Behind-the Head, dual ear style wear with or without hard hats or helmets Quality components and rugged construction 1-Year WarrantyIP 68 rated PTT Button on the ear cup with rubber cover to protect from sand in fracking operations.