Built-in Battery: With high performance rechargeable polymer battery, this headphone provides up to 6 hours of music time, less than 3 hours of charging time Function: Durable Earphone With mic Tangle Free cables and Call Receive / Cut and Play / Pause Button (Change Track on Double and Triple Click) makes it easier to have long lasting, tangle and frustration free music and call experience. These sweat resistant earphones are great for running and gym workouts. Universally Compatibility: Suitable for most Bluetooth-enabled devices and smartphones. Multi-functional Design: Support wireless connection via Bluetooth, & wired connection with phones/computer; Support TF card playback, insert the TF card into the headphone to play music when there is no phone. High Fidelity & Clear Bass Effect: This headphone supports various sound effects adjustment, easily realize the sound quality you prefer. Features Enjoy a fulfilling audio experience with this over-the-head, compact headset equipped with plush ear pods for comfort. With an over-the-ear design, this headset lets you chat all day comfortably with cushioned ear pads. This headset has dynamic 40mm drivers so you can listen to your playlist with clear fully detailed sound with deep bass. This headset is compatible with smartphones, tablets, notebooks and mobile phones with Bluetooth support including iPhone, iPad, Android smartphones and many others. This headset comes with a 3.5 mm jack. Specifications: Type: Open Air/Dynamic Driver Unit: 40 mm Diameter, Dome Type Power Handling Capacity: 50 mw Impedance: 32 Ohms at 1 khz Sensitivity: 108 db/mw Frequency Response: 12-22000 hz.