High Power AXON Model Body Worn Analog Pocket Hearing Aid Best Sound Amplifier V-99 Pocket Hearing aids for deafFeatures:*High quality， Aluminium Alloy cover*Without grating sound*N-H Switch*On/Off switch*Volume Control*Main Unit Size 6.1*4.1*1.6 cm，NW:46g*Use 7# BatteryTechnical Parameters:Model: V-99 Pocket Hearing AidMax Sound Output: 129dB 4dBMax Sound Gain: 55dB 5dBTotal Harmonic Distortion: 5%Frequency Range: 450~3500 hzEquiv Input Noise: 30 dBBattery: 7# dry batteryWorking Voltage D. C. 1.5VWorking Current: 4 mAPacking Details:Packaging Gift color boxColor Box Size: 8.5*12*3.3cmQuantity per carton 200pcs/ctnMaster Box Size 44*34*52.5cmGW per Box 0.13kgsGW per Carton 27kgsInstructions:1.The wire plug connected to the headset.Then earplug connector (hard) to the headset， earbuds (silica gel) to connect to the headphone connector pedestal2.The battery installation: Gently open the battery compartment cover， put a battery into the battery compartment in the right direction， then close the battery compartment .3.Before you use this item ，you have to turn the ON-OFF switch to Off，and turn the sound volume to minimum4.Then put this item on you ear， keep it tightly5.Next， turn this item ON， adjust the volume until you hear clear soundNote:- 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 appropriate choice of earplugs and plugged， make sure no air leakage.- Please regularly clean the ear plugs or ear molds in order to ensure the normal use of hearing aids.- Use for long periods of time， please remove the batteries to prevent battery rot erosion hearing aid components.Package:1 x Hearing Aid 3 x Earplug(Different Size) 1 x Instruction manual (English) Hearing aid you receive will not come with AAA battery，as it can not ship by air.