Unfortunately, it didn't last long. I bought in September 2018 and the devices lasted until mid-December. They failed after about a week, which is very interesting as they had a completely different number of on/off hours. illuminated. I suspect the resistor has failed or burned out. I will order them again despite the cost because I hope the manufacturer fixes the problem and sells a more reliable product. Until then, however, the design flaw warrants a star. Check out my photos of the insides of this product! Live a good life. All the best. For your health!