1.)Adjust volume to the minimum level or switch off before wearing.

2.)To choose the right size of ear tips to avoid any extra noise.

3.)Increase volume gradually to avoid sudden increase in sound.

4.)If you hear a howling,check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage.

5.)Please regularly clean the ear plugs in order to ensure the normal use of hearing aids.

6.)Use for long periods of time, please remove the batteries to prevent rot erosion hearing aid components.

7.)Keep out of reach of children.

8.)The device is not water resistant.