Specification Bluetooth version: Bluetooth 4.1; Operating distance: up to 33ft; Battery: Rechargeable Lithium Battery 60mAh; Frequency: 2.4GHz; Standby time: up to 14 days; Charging time: about 1 hour; Playing/talking time: up to 8 hours; Input: 80mA/5V; Color: Black; Ergonomically Designed: The flexible ergonomic design that naturally fits the contours of your ears and interchangeable ear buds maximize its comfort and performance.Noise cancelation technology reduces surrounding noise and makes your voice nice, clear and easily heard. Connect 2 Devices Simultaneously The latest Bluetooth technology allows the headset to wirelessly connect with two devices simultaneously, and you can switch devices effortlessly. Multifunction Control: Volume and track control are conveniently located on the headset. And this wireless Bluetooth earphone makes your phone calls hands free, it definitely will be very convenient for you.