I purchased several dozen of these flashing necklaces to give out on halloween and only 19 out of 60 worked. In contacting the company (Daniel) states he buys directly from China and there is no guarantees on his items. He even said at least 10% will be faulty, but 75% broken is unacceptable. I am sending them all back for a full refund + shipping cost. I will update you if this company doesn't follow through with the refund. So buyer beware, this kind of business gives the internet a bad name. Please do not support Flashingpanda.com.