Description This amplifier is a great solution for those with hearing condition or in need of precise sound amplification. They are unique and best. Whether you love listening or playing music, or have some hearing issue, or just want to experience a new and exciting level of hearing, our amplifier is an optimal choice for you. Features - Color: As shown. - Material: ABS. - Size: 4.6 * 19 * 1.4cm (L * W * H). - SOUND AMPLIFIERS: precise quality Behind the Ear sound amplifier for those who require amplification. - SUPERIOR DESIGN: The amplifiers are designed by expert audiologists. They come with digital circuitry and fully digital volume control for convenience. - EASY-TO-USE: Our amplifiers are constructed user-friendly, with easy on and off button and volume control that allows the user to make accurate adjustments in no time. - COMFORTABLE: This amplifiers perfectly fit behind the ears of both men and women. They are small in size and feather-light and can be comfortably worn whole day long. Specification Distortion: le;15%。 Frequency: 450-5000Hz. Working Voltage: 0.2V. Working Current: 4mA. Weight: 4g.Packing list: 1 x hearing aid_x000D_ 2 x batteries_x000D_ 1 x manual_x000D_ 4 x ear muff