Features： 1. Smart chip, noise reduction, HD hearing sound. 2. External microphone, decrease whistling feedback. 3. Only 5g, lighter than other similiar products 7g / 10g in the market, less burden to ear. 4. 60mAh Rechargeable battery, charge for 2 Hours, use for 30-40 Hours. 5. Designed for mild, moderate, severe hearing loss. 6. Hard shell, drop-proof material, IPX4 waterproof design, longer use life. 7. FCC, ROHS, CE, EMC Certifications available. .