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Prodctuct technical parameters: Wearing method: Behind the ear Color: Beige Appropriate population: hearing supplement for patients with air conduction hearing loss Electrical performance: 1. Maximum saturated sound output: (OSPL90) ≤ 129 + 3dB 2. High frequency average: (OSPL90) 118dB ± 4dB 3. Full sound gain (high frequency average) 36 ± 5 dB 4. Harmonic distortion ≤ 10% 5. Equivalent input noise level ≤ 32dB Product weight: 3g(without battery) Size: 38.5*15.5*9.6mm Material: ABS Made in China Packaging include: Sound amplifier*1 Shockproof box*1 catheter*1 Battery*1 Brush*1 Earplugs*3 Instruction manual*1