features of BT 5.0 technology, 3.5mm Audio Port, built-in Microphone and Speaker, TF Card MP3 Player, Hands-free call, the BT Headphone is a super companion for you during daily life and travel. Features: Multifunctional: Equipped with features of BT connection, TF card music playing, AUX-IN wired music playing, and hands-free call with Microphone. BT Connection: With BT5.0 function, easy to pair with almost all the BT-enabled audio devices, freely to enjoy wireless music and hands-free calls. AUX-IN Function: Connect to the audio devices (such as MP3 / MP4, Laptop, etc) without BT function via the included 3.5mm cable. Long Battery Life: Built-in 200mAh rechargeable battery lasts up to 6 hours of music playing time and 24 hours of standby time per charge cycle. Ergonomic Design: Adjustable headband length, soft leather ear cushion, comfortable to wear, and easy for storage. High-sensitive Mic: HD microphone reduces ambient noises and grasps the detail of voice. You can get high-quality hands-free phone conversation. Note: When in AUX-IN mode, it is an ordinary wired headset and buttons cannot work.