Features: new and high quality usb receiver. 2.4G usb dongle for Razer Basilisk X HyperSpeed wireless mouse receiver. (please disconnect the mouse cable when pairing the code with mouse). If you can not connect the receiver to the mouse, please restart the pc, reinstall the software, install all mouse drivers . The computer need to be paired once before the mouse is used. After pairing, any computer is plug-and-play: Easy install and use. Specifications: Item: 2.4G Usb Receiver for: Razer Basilisk X HyperSpeed wireless mouse Color: Black Material: Plastic Size: As Pictures Quantity: 1PC Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1 x Usb Receiver