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Lynx-310 BTE Personal Sound Amplifier is a behind-the-ear hearing amplifier with a built-in electronic sound amplification system for amplifying environmental sounds and voices; sounds and voices that amplified are delivered electronically to your ear via the audio wire coming down the front into the ear-piece where a speaker is installed. Because the device casing is located behind the ear ensures the wearer the comfort feeling while wearing the device. The device is indicated for the wearer hearing soft sounds that would be difficult to hear, amplifying distant conversations and performance, watching TV with volume on low not to disturb surrounding people, and more..... Each Lynx-310 BTE Personal Sound Amplifier comes with three latex rubber ear-tips and three AG-13/LR-44 Alkaline cell batteries; each of the AG-13/LR-44 cell batteries might last 100 hours of continuous use. The device accepts also zinc air batteries that promise additional hours for continuous use. The device conforms to the ANSI S3.22-2009 test standard for regulating air-conduction hearing devices by U.S. Food & Drug Administration, is subject to applicable provisions of the Radiation Control for Health and Safety Act of 1968, under which FDA regulates electronic products that emit sonic vibrations, such as sound amplification equipment, also complies with the regulatory requirements to repurchase, repair, or replace that made under 21 CFR Part 1004.