The Digital Clock is an exact replica of the Davtron 803 Electric Clock. The LCD is custom made for TRC Development in Asia. The replica is so close, that you can use the original user manual. The Digital Clock functionality is software driven by it's own USB driver. The LCD has backlight, which is also controlled via USB. The Digital Clock works exactly like the CCU version.
For this standalone USB Digital Clock you don't need a seperate controller. It connects directly to your computer via USB.