The SportEAR Select-A-Fit 30 Electronic Ear Plugs system is perfect for great protection and ease of purchase and use. It includes 5 different comfort tips to customize the fit of your SportEAR for maximum comfort. The Select-A-Fit shell uses a non-allergenic medical grade rubberized material for an ultra comfortable fit and durability in the outdoors. These ear plugs are water resistant, have a wind cover for the microphone, and have a low battery signal. Features a 30 gain volume control with AutoBlocker technology to block out harmful sounds such as a gunshot. These plugs also have background noise suppression and a whistle cancelation feature.