Rapoo Wireless Combo set KB-9300M | ShopAt24.com- ผ้าอ้อมขนาด 1 vs 2 0 ,May 08, 2019·Switch between Bluetooth 3.0, 4.0 and 2.4G. The smart switch between Bluetooth 3.0, 4.0 and 2.4 GHz ensures stable wireless transmission. You can still use the combo regardless of USB port shortage or the loss of receiver. 1300 DPI tracking engine. Enjoy accurate and smooth cursor control with the 1300 DPI invisible tracking engine.