Product Information
<br />Product Name:Inner ear hearing aids
<br />Color: red/blue
<br />Material:Plastic
<br />Host Size:1.8cmx1.2cmx0.9cm
<br />Net Weight:0.3kg
<br />Gross weight:0.5kg
<br />Category:Customized
<br />Battery:A10
<br />Calibration:Automatic
<br />Frequency range:200Hz~7645Hz
<br />Working current:1.36mA
<br />Compression rising time:48ms
<br />Equivalent input noise:27.6dB
<br />There are Whistle as you put the battery into the hearing aid .
<br />Please donot worry .because the air presure will make Whistle.
<br />1.Please adjust lower volume .
<br />2.Choose the suitable ear plug 
<br />3.Make sure if you put the earplug tightly,sound leak will make the Whistle.