4 out of 4 that I bought. (two double and two triple).. they don't make good contact with the sockets, when you plug in a device and remove it, it makes a buzzing sound and the light flickers (no other product has a problem with sockets). I tried them in many sockets, they don't make good contact and make the noise of electricity (buzzing) when they don't make contact, resulting in power outage. Of course, I will throw them away. It's not worth going through the process of returning them because it's very likely that more problematic ones will come. Stay away from these sockets and don't buy them. I have never experienced this with other surge protectors or single sockets.

Bravo to powertech for not having any Quality Control in the factory. Bravo to Data media for importing such a useless and dangerous product. Whatever I say is not enough. Stay away, buy another one, don't waste your money on these...

The product has huge manufacturing problems, stay away