Ordered a replacement on the 7th afternoon and received it first thing this morning (10th), unpacked and it worked straight away, no problems or fuss. I'm sure the fish are much happier now that I can get their lights working properly. As an aside, there was nothing wrong with the original. I only have 3 kids who love playing with aquarium lights (especially the storm feature) and managed to lose the retractable part that holds the battery. There is no battery or remote control, just a retractable part and the remote control will not work without it.
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