Description: This pair of Bluetooth call center headphones give you a wireless noise cancelling communication. Advanced Bluetooth CSR8615-V4.0 CLASS2 assures a stable and smooth connection, gives you a hear-and-be-heard communication with no delay. And free adjustable earmuff and stretchable headband offer a so comfortable wearing that you will not be bothered by fatigue or pain after long time wearing. Furthermore, it allows you to have phone calls for 12 hours continuously with no stuck or cut. Specifications: Product type: Call Center Bluetooth Headset Bluetooth version: CSR8615-V4.0 CLASS2 Supported protocol: HFPV1.6, HSPV1.2, A2DPV1.2, AVRCPV1.4 Phone call time: 12 hours Standby time: 250 hours Charging port: Micro USB Battery: 3.7V 180mAh lithium battery Bluetooth connection distance: about 10 meters Microphone: YES Suitable: For computer, phones, for compatible with iPad, and other Bluetooth devices Package size: approx. 18.5 * 14 * 6 cm/ 7.28 * 5.51 * 2.36 in Package weight: 156g Package List: 1 * Call Center Bluetooth Headset 1 * USB Charging Cable 1 * User Manual 1. Noise Cancelling Communication - The Bluetooth call center headphones come with noise cancelling function to keep background noise outside and clean surrounding noise to create a clear communication. 2. Comfortable Wearing - Earmuff supports 360° rotation. Headband can be sretched and put away. Makes it suitable for head of different sizes to give you comfortable wearing. No fatigue or pain even after long time wearing. 3. Universal Compatibility - This call center bluetooth headset can be plugged into computer, telephone, desktop box and other devices to achieve clear, stable and smooth communication with no stuck or conflict. 4. No Falling - The head guard turn will close to your head to give you a secure wearing without falling. Let you work breezily. 5. Long Phone Call Time - It has a built-in 180mAh lithium battery, which gives you super long and continuous phone call time up to 12 hours. You don't have to worry about its sudden powering off.