Features: [4 in 1 Multifunctional Headphone] Stereo BT + 16G TF Card MP3 player + FM Radio + 3.5mm Wired Headset function. [Wired and Wireless Connection] BT 4.0 + EDR technology ensures strong signal and fast transmission, easy to pair with almost all BT-enabled audio devices to enjoy wireless stereo music; with 3.5mm audio jack, it can connect to a variety of music players (Such as, MP3 / MP4, etc) without BT function. [Noise Cancellation] Noise Cancellation and high-sensitive microphone reduce ambient noise and grasp the detail of voice. You can get high quality hands-free phone conversation even on the street. [Long Duration Time] Built-in rechargeable Lithium battery lasts up to 10 hours of Talking Time, 10 hours of Music Playing Time and 250 hours standby Time in Power Off state per charge cycle. [Ergonomic design] Foldable and adjustable headband length, super soft earmuff, comfortable to wear and easy for storage.