Question: Are you tired of traditional hearing aids that are noisy, unclear, hard to hear, harsh and uncomfortable, hearing is getting weaker and weaker, materials are poor, easy to fall off when worn, and constant ear pain after wearing them for a long time?We sincerely invite you to try our eardrum-friendly booster. Its advantages: clear and noise-free, no loss of hearing, no impact on answering calls, no falling off when worn, sweat-proof and drop-proof, long-lasting and durable.It intelligently and automatically adapts to the surrounding environment, and will not produce harsh sounds due to sudden noise. The constant sound output is at a volume that is comfortable for human hearing, making it easy to wear anytime and anywhere.Frequency response range: not narrower than 500Hz3200HzMaximum saturated sound pressure level 129+3dbTotal harmonic distortion: the actual measured value should not exceed 8% at maximumOutput sound pressure level (high frequency average) 1204dbEquivalent input noise level: the actual measured value should be 32dBFull sound gain (high frequency average) 385dbRated power supply current consumption: should be 2mAPower supply: USB rechargeablePackage contains: 1 set of smart noise-cancelling hearing aids