(I thought this might go under "Android 101", but I can't start new topics there)
I was asked this morning by a coworker about using a USB device on an Android tablet with no USB connection. When I asked details about what they wanted to do, I was told they wanted to move a lot of files off the device and onto the SD card but wanted to know if a USB mouse would work as a convenience. I told them they would need an OTG (On The Go) adapter/cable to convert the micro USB to a standard USB and it should work great. Afterwards, I connected said adapter to my Nexus 7 and used the Logitech keyboard/mouse combo. I also have a Logitech Touch K400 that I use if I need to compose an email and just don't want to use my laptop. Works great.
This works great too:
Updated by Lee Bo, Sep 3 '13 @ 8:10 AM.