If there are any issues with your Razer Naga Expert MMO you should visit the Troubleshooting Page.
Background and Identification
The Razer Naga 2014 was released in July of 2013, and is identified by its black shell with a green LED Razer logo where your palm touches the mouse. It has green detailing on the scroll wheel and front cover. This model is most often used for gaming due the 12-button mechanical thumb grid, but also works well with any other need for keys that they keyboard doesn't offer. You can change the DPI of the Razer Naga 2014 up to 8,200 dots per inch, or any value smaller. It also has a 7-ft. braided fiber cord, and 19 MMO optimized programmable buttons total on the mouse. This model has an extremely similar cordless twin called the Razer Naga Epic Chroma.