Z-127D In-ear Sound Amplifier Digital Display Hearing Aid Earphone 1. Soft and comfortable silicone earplugs, different sizes of earplugs are suitable for everyone. 2. Excellent sound quality, stable transmission, prevent howling and reduce noise. 3. The digital hearing amplifier adopts bionic design, which fits your skin color and ear shape, and is so small that it is invisible. 4. The rechargeable hearing aid is small in size, light in weight, comfortable to wear, ergonomic and easy to use. 5. Hearing aids help restore your hearing so you can rediscover the joy of spending time with friends and family and feel more confident at work. Parameter: 1. Material: ABS 2. Sound output (MAX): less than or equal to 115+-4db 3. Total harmonic distortion: less than or equal to 5% 4. Frequency range: 350-5000Hz 5. Noise: less than or equal to 32dB 6. Charging interface: Type-C 7. Charging time: less than or equal to 2 hours 8. Working hours: more than or equal to 30 hours Packing list: 2 x hearing aids 6 x ear caps 1 x brush 2 x cerumen sticks 1 x instruction manual 1 x charging cable 1 charging case