Features: new- and a full-range of original 2.4Ghz receivers for Razer wireless mouse and keyboard- Usb dongle for Razer Viper Ultimate Wireless gaming 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 needs to be paired- once before the mouse is used. After pairing, any computer is plug-and-play: Easy install and use. Specifications: Item: Usb Receiver for: Razer Viper Ultimate Wireless Mouse Color: Black / Pink / White 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 measu Package includes: 1 x Usb Receiver