Single sensors design to make the quality of sound more ture and clearly

The extended earphone connector and detached design to make more choose 

The extended earphone connector suit for 3.5mm plug for a pair of standard stereo earphones (not provided).

The elastic Velcro strap that suits head sizes from 12 to 25 inches

The high quality transparent tube is hardly to be detected and clear sounds expression

(All include Velcro strap 1/pc ,transparent tube 1/pc,Mini-din plug 1 pc)

Technical data of earphone speaker
-Transducer: moving coil dynamic speaker Impedance: 32Ω +/- 15%  &1kHZ 
-Sensitivity: 120 +/- 3dB  &1kHZ 
-Resonance freq (FO) 400HZ +/- 20% 
-Rated input power: 200mW Maximum input power: 500mW

Technical data of microphone

-Sensitivity: -37.5+/-2dB  &1kHZ 2.2KΩ 3V 0dB=1v/pa 
-Impedance: Max. 2.20kΩ &1kHZ 
-Directivity: Omni-directional Frequency: 100Hz - 16000Hz 
-Max operation voltage: 10V 
-Standard operation voltage: 3V;
-Current consumption: Max. 0.5mA;
-S/N ratio: Min. -56dB &1.1kHZ

-Best fit forehead / neck size: 12" - 25"