Hearing Enhancer/Sound Amplifier. Two pack. Small, in-the-ear design. Adjustable tone control. dB limiting. Using two sound amplifiers allows the user to more accurately pinpoint direction and distance. Multiple size ear tips included. A great way to try sound amplification in the field in a cost-effective manner. Comes with 4 zinc air batteries (A312). Light weight construction. Natural color finish. Hang packaged. Walker's Game Ear products were developed for the outdoor market by designer Bob Walker, who is a hearing health care specialist and also an avid outdoorsman. He has utilized his knowledge of the human hearing process to provide products which offer sound amplification plus hearing protection. Field tested and recommended by NAHC.