High tech Hearing aid as follow :

Programming cable link :

https://www.aliexpress.com/store/product/2017-on-Promotional-price-programming-cable-for-digital-RIC-BTE-CIC-hearing-aid/921269_32803768811.html?spm=2114.12010615.0.0.352d8910LpTdI4

If you want to programmable hearing aid by yourself ,you must be need these devices 

1.USB programmer

2.Programming cable

3.Audiogram 

Detailed Product Description
This digital hearing aid programmer is used for resetting the parameters

and programming of hearing aids.This digital hearing aid programming unit

together with fitting software and programming cables constitute the complete

HI-PRO system. It serves as a standardized interface between a PC and programmable

hearing instruments.

Technical Parameters:
PC interface
USB connecting lineUniversal Serial Bus portFor the computer and USB

programming connection Communication :SB 2.0 full Speed(USB 1.1 compatible)
USB port type:USB communication

Power Supply
USB The programming voltage enter from the USB port.
Voltage:4.50V-5.25V
Max Current:<500 m A(2.5W)
Static Working Current:<500uA(2.5mW)

Output Range
The following output is for the left and right ears of the hearing aid device cable
Common install battery,apply to left and right ears, 1.35V, 10/50m A (Current

can be adjust by install the software )
Programmable battery,apply to left and right ears, -3.50V to +3.50V, 30m A(Voltage

can be adjust by install the software)

Suitable Operating Conditions
Temperature : +5degreeto+40(41to+104)

Humidity : 30 to 90%,non-condensing
Preheating Time:less than 20 minute

Atmospheric Pressure: 600hpa to 1060 hpa

Notice: Operate product in the temperature enviroment under -20 degreeor over 60 degree,

might cause permanent damage to the product.

Maintain and Sending Conditions
Temperature: -25 to +70(-13 to +158)
Humidity:> 90%,non-condensing
Atmospheric Pressure: 500hpa to 1060hpa

Volume and Weight
Volume(L*W*H): 135mm*108mm*36mm(5.31*4.25*1.42)

NW: 230g(0.43lb)

Security
The USB accord with the below safety standard:
· EN60601-1,Type BF
· UL60601 and CAN/CSA-C22.2 NO 601.1-90
In order to accord with above standard, connect the programming cable

and ports must meet the following requirements:
· When the programming cable and a USB connection, any conductor parts are disassembled.
· Programming cable and port must be able to double isolation and withstand test voltage of 500V.

Service Life
Cervice life:5 years

Standard
Security : EN60601-1,Type BF

Electromagnetic Compatibility: EN60601-1-2