Eight pairs of ceiling speakers installed This tool did it in the same breath. After the device was installed, it only took 5-15 seconds to turn off each of them. Each time this was done, I would take the unit out, take it outside, shake all the dust off the drywall, and blow the unit away. While the unit wasn't cheap, it was more cost-effective than hiring someone to cut and install the speakers. I am happy and so is my wife!