I was using my 500 the other night and there was a talkgroup user talking and I have it set up so a specific LED color comes on with a specific user. Anyways when I picked it up I accidentally pushed F3, which blacked out the scanner. The LCD worked but the LED and backlight went off. I got a little worried but the next time the Talkgroup went active the lights came on, so I pushed F3 again, and black out again. It is a cool little feature, especially when driving at night because those LED's are bright. I thought I would share this little trick with all of you. It may have already been posted but this is for all the new people out there.