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.If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriatechoice of earplugs and plugged, make sure no air leakage.Keep the ear plug clean.Remove the battery if you don't use it for long time. Specifications:Product Name:Pocket Hearing aidMax Sound Output: 129±4 dBMax Sound Gain: 58dB ± 5dBHarmonic Wave Distortion: f<1000Hz≤15%,f＞1000Hz≤10%Frequency Range: 450~3500hzInput Noise: ≤30 dBBattery: 1 x AA battery (included)Working Voltage: dc1.5VWorking Current: ≤4mAColor: As the picture showsItem Size: 6.1 x 4.1 x 1.6cmPackage Size: 18 x 9.8 x 3.8cm
Future-ready technology for optimal hearing
State-of-the-art features for a modern auditory experience
Optimal performance with comfort for the elderly
Sleek and modern design
Cutting-edge features for enhanced auditory experiences