This is a Protoarc RoyalAxe R68 60% Mechanical keyboard - it has Gateron G Pro 3.0 Yellow Switches installed with both the keycaps and key switches able to be replaced. Retail is $59 on Amazon (affiliate link). You can see my quick review of it here. It has an RGB backlight with some customization capabilities but not on a per-key basis. Mostly changing colors and patterns.
It can pair up with five devices (three stored bluetooth pairings, a 2.4 ghz dongle connection and direct USB-C).