The FB makes optical ago what does not work cheap. The size, I personally find good and practical. The programming is really easy. Initially had too much thought "around the corner": Both A and B buttons together and hold until the LED flashes quickly. Release the buttons. Then stick to the original FB the button that performs the function that is to be programmed. Now the button on the Simple FB press, which is to perform the function. This pressed until the blue LED lights up continuously. This process took me about 15 seconds .. That's it. For sample: press button indicator to light solid blue.
