Wireless Hearing Aids Mini InEar Type Ear Sound Amplifier Elder Hearing Aid Right Ear Condition: Item Type: Hearing Aids Material: ABS Power Supply: 1pc 10A battery (not included) Button to adjust the listening mode: The default listening program on startup is Listening program 1. Click the listening program every time Select the key and listen the following sequence: Listen procedure 1- Listen procedure 2-listen procedure 3-Listen procedure 1Listening procedure 1(medium-to-high frequency) is used by people with medium-to-high frequency hearing loss, such as age-related hearing loss, perforation of eardrum, etc. Listening procedure 2(high frequency) for use by patients with high frequency hearing loss, such as medically, congenital or neurologic hearing loss; Listening procedure 3(full frequency) 1 is full frequency amplification, suitable for hearing loss caused by otitis media, strong vibration, perforation of eardrum, etc. Usage: How to wear a hearing aid:  1. With a removable tool, hold the hearing aid with a handle at the bottom and a white spot at the upper part, between your thumb and forefinger 2. Gently insert the part of the auditory canal that pushes back and plugs in, full placing the auditory device in the correct position Before placing the hearing aid into your ear, make sure the battery is properly inserted and the battery door is closed and secured. On and off functions Turn off the receiver and turn on the hearing aid. The battery door is full open. Turn off the hearing aid by opening the earphone battery door Note: Do not forcibly open or close the battery cover, use the brush head to hold the battery and open the hearing aid battery compartment