1. The driver unit, made by Titanium metal, has superior performance in treble, and it work well in combination with composite diaphragm, immersing you into shocking and marvellous sound. 2. Advanced noise cancelling technology improves the high definition of this headphone, providing you high clear musical experience and handsfree call. 3. Bluetooth 4.1 version chip guarantees lossless, high speed transmission and stable connection, the distance is up to 10 meters. 4. Built-in 300mAh high quality battery, only need 50 minutes for full-charged, support 4-6 hours working time. (Depend on the volume you adjust.) 5. Humanized headband design, it could be twisted, you would not feel any pain or burden after long time wearing, comfotable and cozy.