Task: Question Answering
Input (English): Installer arrived a few minutes after 8 and hooked up 4 receivers one was a 1 DVR . A few notes : Wiring was done very well , concealed in a way as to not look obtrusive . He took the time to discuss mounting options and I was able to have my first choice . Very friendly and explained everything he was doing . 
Question: What's a possible reason the installer was   very friendly and explained everything he was doing ?
Output (English): Because he believes in being professional .