Sennheiser HD 4.50 Bluetooth Wireless Headphones with Active Noise Cancellation, Black and Silver(HD 4.50 BTNC)

NoiseGard active noise cancellation to reduce ambient noise levels improving the listening experience

Bluetooth 4.0 and aptX technologies to deliver exceptional wireless sound quality..Connectivity Technology: Wireless

2 year warranty when purchased from an authorized Sennheiser dealer

Up to 19 hour battery life with Bluetooth and NoiseGard activated and is supplied with connecting cable for battery free listening

Intuitive ear cup mounted controls for changing tracks and for making calls via the integrated microphone. Frequency response (Microphone) : 100 10,000 Hz