Old Man Hearing Aid Sound Amplifier Sound Collector, Red, Blue

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