The Walkers Game Ear Archer's Choice Digital HD Hearing Enhancer is optimized for the serious bow hunter. With high Definition Digital Signal Processing, the Archer's Ear streams consistent, clear, clean sound enhancement. Three different sized soft silicon ear buds are included for low noise environment allowing for comfortable all day use. When worn in loud environments, like when using power tools or shooting, the included foam plug must be worn. The foam plug provides a 29 dB Noise Reduction Rating. The Archer's Ear is a critical piece of equipment that will give you the extra advantage to bring game home.