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KF-809 USB Rechargeable Behind the ear hearing aid
Feature:

CE certificate: 93/42/EEC  ISO135485:2016
1, Save Money: Don't need often buy the batteries for hearing aid,Batteries Warrant: more 18 months.
2, More Convenient: Use USB interface, Can connect power bank, and computer, Rechargeable anytime and anywhere.
3, Latest IC ciruit Systme: The sound is more clear, The noise is smaller,
4, Sound gain: The crest value is bigger, More than 50dB.
5, Worldwild universal USB cable and adapters: 100-250V, Include Asia,Europe,Middle East,Africa, Amreica,etc.
Technical Parameter:
1, Max sound output:132±3dB
2, Sound gain:52±5dB
3, Total harmonec wave Distortion:≤2-10%
4, Input noise:≤26dB
5, Current:≤3mA,
6, Voltage: DC 3.7V(Lithium Battery),
7, Batttery Warrant:18 months,
8, USB cable and Adapters, 100-250V,KF-287Y Metal frame pinhole glasses 

1、The glass helps to relax the eyeball muscle, and adjust eye focus.2、Theory is very simple: when the eyes can only look through the small  holes, they naturally change focus to a relaxing standard, so that the eyeballs are relieved from the previous nervous focus.3、You can feel the relaxation once you ware it and afterwards.4、Good and simple eye relaxation for a large population whose job causes 5、tired eyes: students, teacher, white collar, computer users.. age from child to aged people, etc.