There are three types of hearing loss including: sensorineural hearing loss, conductive hearing loss and mixed hearing loss. Most people lose at least some degree of their hearing as they age, and by the time they reach age 65 and older, one in three people has some type of hearing impairment.

For Tinnitus
Tinnitus ("TIN-a-tus" or "Tin-EYE-tus") is the medical term for the sensation of hearing sound in your ears or head when no external sound is present. In most cases, tinnitus is a subjective noise, meaning only the person experiencing it can hear it. Typically, people describe the sound as "ringing in the ears," though others describe it as hissing, buzzing, whistling, clicking, roaring and even chirping. Tinnitus can be sporadic or constant, with volume ranging from subtle to debilitating. Tinnitus affects 50 million Americans.

Specifications:
Charger : DC 5V/50mA~lA
Battery: Lithium battery 60mAh
Size: 1.77*1.57*0.39 inch
Wight: About 0.015 Ib
Max sound output: 129±4dB
Sound gain : 38±5dB
Frequency range: 400Hz~3800Hz
Input noise: ≤28dB
Votage: D.C.3.7V
Current: ≤2mA

Package included:
Hearing aid x 1（For Left Ear）
Earplugs with 3 size x 6
Brush x 1
Manual x 1
A13 Battery x 1

Q: How do I know if my hearing aid batteries need changing?

A: Depending on how often you use your hearing aids, you may need to change batteries once a month. You should change your hearing aid batteries if either of these occur:
Sound becomes distorted or you have to turn up the volume on your hearing aid more than normal.
The “low-battery” beep or voice sound comes on, indicating that the battery is getting low and should be changed.