Needs An Update for 10.12.1 Sierra
Works well for controlling brightness right from the menu bar, it gives you a slide thingy just like the volume control. If you wanted to assign F keys to control brightness then pass on this one, until it gets an update. I tried to assign the F1 and F2 keys on my Apple Keyboard With Numeric Keypad to control my Non-Apple Monitor and it didn’t work. I even tried to assign the non macOS useable F5 and F6 keys (which have nothing printed on them) and it still did not work. I think the app just needs an update as it was last updated about two years ago in Feb 2015 and for this i’ll just give it a 3/5.
G_BF about
Brightness Slider, v1.2.6