Specifications: Bluetooth Specification: 4.0+EDR Bluetooth Profile: HFP1.6 HSP1.2 AVRCP1.4 A2DP1.2 Supports APT-x feature (HiFi stereo) RF Range: 10m Noise reduction: CVC6.0 Calculating Conversation Time: about 5 hours Charging time: About 2 hours Dimension (L×W×H):40x24x32mm Weight: 0.2kg Features: Portable and light weight fashion design, very easy to store in your bag. Ergonomic earbud design, comfortable to wear. CVC6.0 intelligent noise reduction. Sweatproof design, best choice when you do sports. With CSR4.0 APT-X audio decode technology, offering you perfect sound. It can connect with two bluetooth devices at the same time. Note 1.Before you start using the headset, please use the USB charge cable to charge it first. 2.Pairing, press the power button of the headset, you will see the blue-red light blinking, it will automatically enter pairing mode. 3.Make sure you turned on the bluetooth on your phone, search headset model on it. The headset support the laptop which with built-in bluetooth adapter or inserted in a third party bluetooth adapter. 4.Select the Bluetooth model and click connect. Enter the password or code 0000 if needed.