Miniature audio earphone of discreet comunnication STANDARD

Size: length 15mm, average 6mm
Frequency: 200Hz ~ 8KHz
Distortion: <1%
Receiver: Electromagnetic convertor Knowles
Air – zinc  battery  PR230 H PR 10, average 5,8mm, high 3,6mm, power 1,4 V, capacity (mAh) 75 Weight    0,3g                    
Running time of earphone to 24 hours. 

Effective life: to 100 hours after unstick of safety label, preventing before air supply     
Weight including battery: 2g