High Performance Wireless HIFI Bluetooth Stereo Headphones with Built-In Microphone & Rechargeable Headset for Hands Free Calling & Multimedia Streaming-(Black) Equipped with noise reduction and echo cancellation technology, this High-Performance Bluetooth Headphone Black enables high-fidelity and rich music besides exceptional video experience. This Bluetooth headphone supports superior audio transmission mode (A2DP) Ver1.2, audio and video remote control mode (AVRCP) Ver1.0, as well as Bluetooth file transmission agreement OPP. Built-in Microphone for answering and hanging up the phone Bluetooth standard: Bluetooth 2.1 + EDR Smart Bluetooth, wireless HIFI