Walker’s Game Ear HD increases hearing up to 7 times and has 48 dB of power with a pre set high frequency response circuit. This is a Digital High Definition unit with emphasis on high frequency sounds, which are the sounds we need to hear when we are in the woods. Walker"s Game Ear devices include a Sound Activated Compression circuit that when combined with the ear plug design protects hearing from loud sounds such as muzzle blasts. The Noise Reduction Rating of 29 decibels is among the highest in the industry. Each BTE unit also weighs less than 1/4 ounce - so light you hardly notice it - and wears comfortably behind the ear even when wearing glasses. Walker"s Game Ear is the outdoor industry leader in hearing enhancement with hearing protection. They have been helping hunters and shooters enjoy the outdoors and take more game for nearly 20 years. Includes: Game Ear, SoundTube Earplug, #13 Battery.