Samnyte Bluetooth Headset, V4.1 Hands Free Car Bluetooth Headphones Noise Reduction Mic Latest Bluetooth 4.0 technology for quality wireless music streaming. Rechargeable built-in lithium ion battery for up to 10 hours of playback time. Built-in microphone for a hands free speakerphone experience. Compatible with a variety of electronic devices such as smartphones, laptops and PC desktops. Alpatronix also has a 100% customer satisfaction guarantee, and wants every customer's experience with us to be a positive one regardless of their purchase decisions.