Bluetooth technology ensures transmitting strong signal in high quality with high-fidelity stereo music Wireless dual ear stereo design, left and right ear channel separation You can use the Left and Right ear earphone solely High-sensitivity microphone reduces ambient noises and grasps the detail of voice Simultaneously connect two smarts phone So you can seamlessly switch between your business and personal phones With 450mAh charging, you can charge for the earphones and can be used as a perfect storage case for them