Problem if you met:
Pls read the manual at first if don't know how to use it or contact our customer service.
If you feel the whistling sound:
1. Choose a suitable ear plug to make the product sealed in the ear canal
2. Low down the sound volume
3. When you put into battery , please be quick , to put the product into the ear
Adjust volume to the minimum before wearing.
Choose an earplug of slightly bigger size to avoid whistler.
Increase volume gradually to avoid sudden increase in sound.
Keep the ear plug clean
Remove the battery if you don't use it for long time.
Shipping & payment & return
Warranty & return:
This product will have 12 months guarantee, any problems with the device, we will repaire for you for free during the warranty.
~100% of all delivered products are in good quality and under strict checking before sending.We will try our best to avoid quality problem.
1) Please leave us positive feedback and 5 star rates, if you are satisfied with our item and service.
2) Please CONTACT US before leaving any 1,2,3 ratings, neutral or negative feeback or open an dispute, we understand your concerns, so we will do our best to resolve the problems for you, thank you
Any problems you met, pls contact us at once, we are very responsible seller and we are professional in medical hearing aid supplies.
Digital High End Quality Programamble Audiometry Hearing Aids,Please click below picture to buy which one you are interersted in.