Old People Voice Amplifier Hearing Aid Magnetic Charge Dual-unit Sound Collector US Plug 1. Material: ABS 2. Hearing aid battery capacity: 40mAh 3. Hearing aid charging time: about 2-3H 4. Hearing aid usage time: about 35H 5. Working voltage: DC 1.5V 6. Working current: within 4mA 7. Frequency response range: 250-3800Hz 8. Size of a single hearing aid: about 28x15mm 9. the charging compartment needs to be plugged in for charging, and does not contain lithium batteries Features: 1. Intelligent noise reduction, high-definition sound quality, no interference, no delay, restore the real sound 2. Stepless tuning, no fixed gear, suitable for various degrees of hearing loss 3. With a charging indicator, the red light is always on to indicate that it is charging, and the yellow light is always on to indicate that the charging is complete 4. Silicone earplugs, good elasticity, soft and comfortable 5. Exquisite and compact, easy to carry and comfortable to wear