Item Type: Ear Care
<br />Brand Name: etder
<br />Material: Medical plastic
<br />Size: 3.8*2.1*0.9cm
<br />Model Number: zj108f
<br />Max.saturater volume output: 130±5dB
<br />Max voice gain: 55±5 dB
<br />Equivalent input noise level:  30 dB
<br />Directivity: omni-directional
<br />Distortion:  6%
<br />Gain: 30db
<br />Frequency: 100-4000HZ
<br />Signal to Noise Ration:  28db
<br />Working Current:  3MA
<br />Battery: 1.2V