Product review (5 stars): Sensors work through windows and walls
First and foremost, it works!  Outside transmitter no problem connecting to the inside unit (as opposed to the last LaCrosse unit I got stuck with).  Runs on battery or AC. A number of features like high and low temps and humidity and adjustments to both if necessary.  I waited about 20 minutes after activating the unit for everything to self adjust and found no other adjustments were necessary.  I would recommend this unit to my friends.