G10SPROBT (dual mode) usage: 1. How to pair Bluetooth: do not plug in USB first, press OK + Return at the same time, Bluetooth will come out. 2. If you want to use USB, just plug in USB, plug and play. 3. How to switch: if Bluetooth is already connected, to switch to USB, disconnect Bluetooth first, then plug in USB; if USB is already connected, to use Bluetooth, unplug USB first and then press OK + Return at the same time to pair Bluetooth.