SteelSeries Rival 5-Buttons, PrismSync RGB Lighting 18,000 CPI The manufacturer's TrueMove Air Optical Sensor in Black February, March, April, May, June, July, August, and September October November December 12345678910111213141516171819202122232425262728293031202220212020201920182017201620152014201320122011201020092008200720062005200420032002200220012000199919981997199619951994199319921991199019891988198719861985