Tesoro Technology USA Inc., a manufacturer of high-tech gaming products, today unveils the Tesoro Excalibur RGB LED backlit mechanical keyboard with a 16.8 million color palette. 16.8 Million Color Palette Named after the legendary sword of King Arthur, Tesoro Excalibur RGB lets gamers choose virtually any backlight color, 16.8 million. The Excalibur RGB's illumination can be set to breathing mo... more.