Thank you for the reply Dick. We are just worried about accidently leaving the scanner on when the vehicle has been checked-in for the night (or week - sometimes), and drain the truck's starter battery. While there are many power failsafe hardware alternatives, having the scanner do an auto shutdown (in say 2 hours of no user interraction) seems the most cost effective. There is so much county traffic occuring (Law, Fire, Tactical, PW), that after 2 hours - when the timeout turns the power off - the operator will soon notice the abnormal quiet and do a manual power-ON (hi hi hi)