1. Adjustable headband, wearing comfortable
2. The function of the noise elimination technique
3. Omnidirectional microphone, clear voice rebounded
4. Super comfortable soft mattress
5. With the volume control

Driver Unit: Φ 40mm
Speaker Impedance: 32 ohm±15%
Speaker Sensitivity: 107dB±3dB
Speaker Frequency Response: 20-20，000Hz
Maximum Power Input: 50mw
Microphone Operating Voltage: 4.5V
Microphone impedance: 2.2K
Microphone sensitivity:-54dB±3dB
Microphone Frequency Response: 100-16，000Hz