ECSEM Wireless Sport Stereo Bluetooth Headsets Headphones, Adjustable headband & Volume Music Streaming Bluetooth headphones/microphone (White) Stereo HI-FI music streaming playing. Supports hands-free calling answer /end , volume control and prev/next music playing. Using CVC echo cancellation technology and noise reduction with DSP digital signal processing function; Adjustable design with plush padding offers complete comfort for over the head. Up to 150 hours Standby time and 10 hours working time.