Logitech G on Twitter: "In 2014, we launched the G502 Proteus Core, which became the first in a line that grew to be the best selling gaming mouse on the market. #UltimateCountdown
Amazon.com: Logitech G502 Proteus Spectrum - RGB Tunable Gaming Mouse - 12,000 DPI On-The-Fly DPI Shifting with 11 Programmable Buttons (Renewed) : Video Games