Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Mac Users Beware

If you're planning on using this switch with a Mac keyboard: Beware. Although is says "For PCs and Macs" on the box, this switch will NOT work out-of-the-box with a keyboard that has extra USB ports (which all modern Mac keyboards have). It needs the AC adapter, which is not included.Forget about finding a generic adapter at Radio Shack. The SV431USB requires an output of 5V DC at 2 Amps, which is next to impossible to find (except on the StarView website of course).This switch looked impressive, but I'm going to have to give it 1 star since I wasn't even able to get the keyboard going. If you have a regular keyboard and don't plan on connecting a USB hub or laptop to it, it might be worth a try.