1. Bi-directional noise reduction
2. Bluetooth V4.0
3. Built-in microphone
4. 3.5mm audio cable
5. Adjustable headband
6. Built-in 400mAh rechargable lithium-ion battery
7. Charging time 2.5 hours, standby 200 hours, talk/music upto 24 hours
8. Driver: 40mm/32Ω
9. Frequency range: 20-20,000 HZ