Mini Rechargeable Middle-aged and Elderly Hearing Aids Earphone Rechargeable In-ear Sound Amplifier for Moderate to Seve

Specification Size 21 7x15x21 9mmWorking voltage DC 3 7V 5 10 Working current ≤ 1 4mAFrequency response 300 5000 HzEquivalent Input Noise ≤29dB 3dBMaximum Saturation Acoustic Output ≤128dB 3dBFeatures 1 Mini size Invisible to wear2 Easy to operate for elderly3 Digital chips Noise reduction Greatly reduce noise providing high clear sound quality 4 USB Rechargeable no need to replace battery use anytime anywhere5 Around 30 Hours to use after fully charged6 Comfortable ListeningPackage Include 1 Earphone1 Charging Dock1 Charging Cable1 Cleaning Brush4 Earbuds1 Manual1 Warranty Card1 Qualified Certification1 Quick Guide2 Accessory Box1 Package Box