Noise Reduction Indicator (Gules LED) 
Noise Reduction On/Off Switch 
Speaker Spec.:   
Speaker type: Neodymium magnet high-end speaker
40mm NDFeB magnet Speaker: 300 Ω 
Frequency Response of Speaker:  70Hz~20KHz 
Sound Pressure Level:  105dB ± 3Db 
Microphone Spec.:   
Impedance:  2.2K Ω at 1kHz 
Sensitivity:  -54dB (0dB=1v/bar at 1KHZ) 
Directivity:  Omni-Directional 
Frequency Response:  20~20kHz 
Microphone Unit Dimension:  6.0x5.0mm 
ANC Circuit.:    
Frequency Response of ANC Circuit:  70Hz~20kHz 
Noise Reduction:   
Maximum Noise Reduction Level:  >23dB (200HZ) 
Noise Reduction Active Range:  100Hz~500Hz 
Cord Lenght:  120 ± 5cm 
Output terminal: 3.5mm mini stereo plug (gold-plating) 

Others:   
1. Rang of Operating Voltage: 3.7V 
2. Operating Temperature: 0°C ~ 55°C
3. Power Source: 400HA lithium Battery
4. Battery Life Span: An average of 8~10Hours
5.Gold Plated dual pins airplane adapter