There are four different designs of the Suprima pcb.
The 407750 has a square reset button (may sit behind a membrane) and a red and green led light.
The 5102160 has a round reset button and a red and green led light.
The 5111603 is in a plastic case and has a square reset button and a single led light that changes colour with operation.
The 5110550 is for the Suprima HE range, it comes in a long plastic case with a potentiometer on the end and three indicator lights.