Features: 1.High and low tone control 2.Left & right ear adjustability 3. Background noise reduction 4.Suitable for people with moderate hearing loss (80-90dB) Specification: -100% brand new, high quality -Product name: Hearing Aid -Material: Silicone/ABS -Color:gold -Power mode: rechargeable - MAX OSPL90: ≤129dB+-/3dB -Harmonic Wave Distortion:≤10% -Frequency Range: 450～5000 Hz -Sound gain: >= 38dB+/- 5dB - Input Noise: ≤29dB+-/3dB - Charing box: Include 300mAH，Full charing about 3 hours OK to hearing Amplifiers recharing about 4 times -Hearing Amplifiers: Include 35mAH，Full charing about 1.5 hours，Working about 25 hours .