Come and see our amazing products. Dual Mode Bluetooth V4.1+EDR, more stable signal and more strengthen data transmission. Stylish, Elegant and Ergonomic design. Adopt the Advanced CVC 6.0 Intelligent Noise Reduction. Built-in High Sensitivity Microphone, provide clear and loud sound. Built-in 60mAh Rechargeable Polymer Battery, support up to 3-4 hours playing/talking time and 120 hours long standby time. Allow you to conveniently answer calls for safe driving or exercising, etc. Smart one match two, can connect two devices simultaneously. Intelligent Voice Prompt, announce incoming caller's number automatically. Note: this mode of Bluetooth headset is only suitable for Right Ear. Pls confirm further with us if any query about packing info, inventory status and time schedule.