Model EZ-145, Cassette Hearing Amplifier, Pocket Type (Body Worn) Design, Worked with One Aa Battery, with Intelligence Uv Box, Gain Level: 50±5db, Easy to Use, Clear Sound, Fit Both Ears, Energy-saving Technology, with 3 Ear Buds(large, Medium, Small)to Fit Most Customers, Comfortable Durable Design, Intercept Sounds From 20 Meters