The USB dongle is hidden in the battery compartment, hard to see and I thought it was missing. Luckily the Revain customer service rep knew where the key was and when I looked a second time I noticed it. What they should do is paint the top of the button differently so it stands out for those who, like me, don't have perfect eyesight. I'm very tech savvy, but I missed this small important part. I forgot the name of the employee who helped me and solved the problem in about 20 seconds over the phone, but I appreciate knowledgeable customer service reps like the guy who just helped me. Many Thanks. Otherwise, you can't go wrong with Logitech keyboards and mice. I've been using them for years on custom builds and anywhere a wireless device can be used. Sometimes in the workplace you want your mice and keyboards connected so employees don't lose them and make the workplace unusable. But if you can use a wireless mouse and keyboard, Logitech is solid and good.
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