Sorry Artful the two working Dye Rotor's have gone. Its only the one black topped one which hasn't. This has had some intermittent faults (it stopped working last outing). I thought it was batteries and replaced, but no joy at the time. It is now working fine though so not sure what happen. The silver button of the back is however, missing.Is that 3 rotors in total.cant see the one with green glass