ZDC-901A Hearing Aid Sound Amplifier Digital Smart Denoising Hearing Aid 1. Material: silicone 2. Weight: about 5 grams 3. Power supply: contains an A10 button battery 4. Packing list: hearing aid x1, earplugs x3 (largemediumsmall), brush x1, screwdriver x1, drying box x1 Features: 1. Open design increases air circulation in the ear canal 2. Don't block your speech, and your voice sounds real and smooth 3. Silicone material, fit to wear, healthy and safe 4. Easy to operate, can be used without debugging belt 5. There will be a beep when the battery is too low 6. Intelligent full-screen noise reduction, automatically eliminate environmental noise 7. Adopt digital circuit, high-fidelity function, keep the sound unchanged, and the sound quality is soft and natural Steps: 1. Open the hearing aid battery compartment 2. Insert the battery 3. Close the battery compartment and adjust the volume 4. It can be used without debugging belt