Rechargeable Hearing Aid Adjustable Tone

Features: The latest developed Lithium battery technology is now available in an excellent inexpensive hearing aid that is both affordable and superior to hearing aids commonly available. This is a brand new revolutionary rechargeable in the ear hearing aid system. You no longer have to pay the price to replace expensive hearing aid batteries again & again....your hearing aid can be recharged over and over again at virtually no cost. This is a truly green hearing aid..... which means no batteries end up in the trash... no more trips to the store to buy more..... no more running out of batteries for your hearing aid.  Specifications: Rechargeable Hearing aid Max Sound Output:129±4 dB Max Sound Gain: 50dB ± 5dB Harmonic Wave Distortion:  ≤5% Frequency Range: 450~3500hz Input Noise: ≤30 dB Battery: Lithium Battery                  Working Voltage: dc 3.7V                       Working Current: ≤3mA       Color: As the picture shows Item Size: 6.6 x 1.3 x 1.3cm Package Size: 15.3 x