features of BT 4.0 technology, 3.5mm Audio Port, built-in high-grade Microphone and Speaker, TF Card MP3 Player, FM Radio, Hands-free call, the BT Headphone is a super companion for you during daily life and travel. Features: Multifunction: Equipped with features of stereo BT, TF card music playing, AUX IN wired music playing, FM radio, and hands-free call with Microphone. BT Connection: With BT function, easy to pair with almost all the BT-enabled audio devices, freely to enjoy wireless music and hands-free calls. Line-in Function: Wired connect to the music players (such as, MP3 / MP4, Laptop, etc) without Bluetooth function via the included 3.5mm cable. Long Battery Life: Built-in 400mAh rechargeable battery lasts up to 10 hours of music playing time and 60 hours of standby time per charge cycle. Ergonomic Design: Foldable and adjustable headband length, soft leather ear cushion, comfortable to wear and easy for storage. High-sensitive Mic: HD microphone reduces ambient noises and grasp the detail of voice. You can get high-quality hands-free phone conversation.