Cassette Hearing Aids, Sound AmplifierProduct information: Maximum sound output: 120dB Sound frequency: 85 decibels Sound Gain: 22. 8dB Total harmonic distortion: 10% Frequency range: 200 5000 Hz Equivalent input noise: 48dB Working voltage: 3V Working current: 10mA Battery capacity: 1150mAH Size: About 10. 5*6*1. 5cm Material: ABS+Silicone Features: Unlike hearing aids, the device has a discreet design that looks like a handheld FM radio. Use the up and down arrow buttons to easily
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