1. Material: ABS 2. Weight: 2.7g (single) 3. Frequency response range: 300-4500Hz 4. Size: 2.8x1.4cm (single) 5. Range of use: hearing aids 6. Working voltage: DC 1.5v 7. Working current: less than or equal to 4mA 8. Power supply mode: USB 9. Features: powerful chip, optimized noise reduction, mini stealth, stepless tuning 10. Packing list: packing box, storage box, manual, charger, cleaning brush, filter changer, screwdriver, silicone earplugs, hearing aid
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