guys some info naman about this button....



a)what do you call this button, i use this if ever my rear windshield gets foggy because of cold weather...

b)how does this work?? i mean, i can see the "lines" in my rear windshield. and everytime i have this button pushed, the lines heats up, hence clears the foggy rear windshield... can't see any wires connected to the windshield.... so i was wondering how this one works...