Step 1: Turn the Invisible Hearing Aid switch on by moving the dial to the ON section
Step 2: Make sure the volume dial is set to the minimum (lowest level)
Step 3: Insert the Invisible Hearing Aid inside your ear
Step 4: Adjust the volume until you hear a sound.Specification
Max sound output: 120dB
Sound gain: ≥30dB
Total harmonic wave distortion: <1000Hz≤10%
Frequency range: 250-3800Hz
Input noise: ≤50dB
Voltage: DC1.5V
Current: ≤4mA
Color: As picturesBattery InstallationGently open the battery compartment cover at the back of the device. Put AG13/LR44 battery into the battery compartment in the right direction, then close the battery compartment.Package
1xMini Hearing Aid
2 x AG3 Button Cells
1 x Instruction Manual
1 x Case
2 x Units of the earplug of different size
