The Howard Leight Sync Stereo earmuff offers DJ-inspired passive noise-blocking hearing protection with excellent stereo quality, allowing users to listen to the radio or music safely and comfortably. The Sync headphones are designed for wearers with an active lifestyle in possibly noisy environments, ideal for doing noisy work on DIY projects, cutting the grass, making music, competitive shooting, general industry work, and more. Simply plug in your MP3 or personal audio device with the cable connection provided and you are ready to enjoy. The Sync earphones manage output volume from your portable devices to safe levels while also isolating loud exterior noises. No batteries are required with these noise regulating headphones since all power and volume adjustments are made via the personal listening device. Padded ear cushions and a diamond-pattern headband with reinforced fork slides make this hearing protection headset comfortable and easy to adjust. The headband is also easy to clean. A Single Number Rating (SNR) of 31 helps protect your ears from loud noises.Box ContainsSync earmuff, 1 input audio cord