iKross Slim Noise-Cancelling Wireless Bluetooth Handsfree Headset with USB Docking Charger and Black Bluetooth Carrying Pouch Case iKross 3.0 Bluetooth Headset with Advanced Noise Cancelling Technology. USB Docking Station Offers Convenient Charging Options without the use of Cable. Advanced Built-In Microphone. Noise Cancelling Technology Eliminates Background Noise for Crystal Clear Conversation. Automatic Answer Feature by Picking Up from The Base. Talk Time: up to 4 hours. Stand by Time: up to 100 hours. Operating distand: 10 meters. charge Time: 2hours