I bought four, two of which initially didn't work. One lit red with no blue, failed to turn off and ran down the batteries. The other failed to turn off and also ran the batteries down. The third one I gave to a friend; I am unsure of its fate. The last one worked well and apparently needs a new battery after a month of use.This is the second time I submitted this review. The first time the distributor contacted me and said they would refund my cost if I removed it. I did, they didn't.