DO NOT BUY! They only turn on the first time (sometimes). If you test this, they will immediately burn from smell. I bought a lot of them, the price is good. So this bad experience happened to me only 9 times. The last time happened yesterday with two of them from the same group. My customers called me back 2 times at different times. Told me it would only work for about 5-10 minutes and then stopped working completely. Very disappointed.