-Powerful hearing aid for severe/moderate/light hearing impaired people,supporting up to 139db, Wide frequence 300-4200Hz. -Simple operation design, One-touch on/off. Seven speed volume adjustment.Anti-drop convenience back clip,suitable for daily use. -Super long battery life USB portable charging.Fully charged for 2 hours, use for 50 hours. -High-quality chip, intelligent noise reduction processing,automatically adjust the sound to a comfortable range to protect hearing, and more realistic sound. -Concealed Fine tuning keys.Open the back cover of the hearing aid, and there are three fine tuning joints that can be adjusted with the included gadget. Speaker amplified: Adjustable 7 volumes Types: Battery/ charging For people: Moderate to severe hearing loss Max OSPL90: 136dB±3dB Full-on Gain: 66±5 Size: 75mm*37mm*13mm Maximum sound output: ≤136dB+3dB High frequency average: 132+4 Equivalent input noise level: ≤25+3 Total harmonic distortion: ≤3%+3% Frequency response range: 300-4200Hz Rated current : 1.2mA 1 Year Quality Assurance： We are confident that our device are manufactured under strict quality standards to give our customers best experience, every product includes a one year maintain, we take care of all quality-related issues

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