The UDM has a very sensitive on-off switch. When you turn it upside down to apply more product to the pad it is VERY easy to turn on. I have brought this to the attention of the correct people. ...... Just last night I was adding polish to the pad and my hand was to close to the switch. I bumped it, the polisher turned on and polish got in my eye. I flushed my eye its OK. It was my fault in part. Just wanted to make every Autopian with a UDM how sensitive that switch is. I love the UDM except for the switch. I'd buy it again, just need to be more careful.