Product Description: 1. This hearing device is designed for 40-60 years old people or people with hearing problems. 2. This device support Programming Service, you can connect your phone bluetooth, updown an APP, then you can programming according to your hearing level. 3. Exquisite and small design, one pair mini black heairng aids, you can use as a earphone, you can connect your phone to listen to music, phone calls, ect. 4. We equipped 3 different sizes earplugs with soft silicone, you can according your need to adjust, and will not hurt your ear, provides you a comfortable experience. 5.The Shape of the sound amplifier conforms to the structure of the human ear canal and it's invisible and comfortable to wear ,it's not only suitable for listening in quiet environment ,but also noisy environment. 6. Intelligent and high quality. Advanced digital signal processing technology can intelligently reduce environmental noise and provide clear, high-quality natural sound. 7. Selected superior chip with fine sound quality and stable transmission performance. 8. Full digital circuitry, low power consumption, adaptive noise reduction, and can prevents howling. 9. Easy to charge. This product is rechargeable hearing aid, and with charging base, you can charging 2 hours and use 12 hours, you can charging at night then you can use during the day, it can save lots of battery costs. Product Parameter: OPSL90: 118dB HFA (Sound Gain): 40dB Equivalent Input Noise: 21dB Battery: 68mAH WDRC Channel: 16 Channels Total harmonic distortion: 3% Frequency Range: 200-6000Hz Charging Time: 2Hs Working Time: 8-12Hs Operation Environment: 0~40,30%~75%RH,860-1060hPa Storage Environment: 0~40,75%RH700-1060hPa Bluetooth: BT5.2(Phone and music support) ECHO Cancellation: Support Environment Noise Cancellation: Support