Size:AXON K-82 Mini Hear Clear Hearing Aid Personal Sound Amplifier In Ear Volume Adjustable AXON K-80 Audifonos Para Sordos for the Elderly. About Whistle , you can do this 3 steps to remove it. 1. Choose a suitable earplug to make the product sealed in the ear canal 2. Low down the sound volume 3. When you put into battery , please be quick , to put the product into the ear Note: Adjust volume to the minimum before wearing. Choose an earplug of slightly bigger size to avoid whistler. Increase volume gradually to avoid sudden increase in sound. Keep the ear plug clean Remove the battery if you don't use it for long time. Features: Brand new and high quality hearing aid sound amplifier Super mini size and light weight, not easily to be seen Adjust volume to the minimum before wearing Increase volume gradually to avoid sudden increase in sound Convenient for watching movie, enjoying the drama, attending meeting, or having class, it could help you hear the sound clearly and loudly Specification: 1. Max sound output: 110±5dB 2. Sound gain: ≥30dB 3. Total harmonic wave distortion: ≤10% 4. Frequency range: 300-4000Hz 5. Input noise: ≤40dB 6. Voltage: DC1.5V 7. Current: ≤4mA 8. Color: As pictures Package Included: 1 x Hearing Aids 2 x AG3 Button Cells 1 x Instruction Manual 1 x Case 2 x Units of earplug of different size
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