How to connect two devices: Please connect one device and then turn off the Bluetooth on the connected device. Please turn on Bluetooth on the new device to connect. Turn on the Bluetooth on the previous device. The headphones will automatically connect back. Now, the headphones is connected to both devices. How to switch headphones between two devices: When you need to switch devices, press the MFB button to pause, and start playback on the other device. When a call comes in, the headphones will also automatically select the device that is calling. After the call is over, it automatically cuts back to the original device.