As the title implies, can anyone tell me the difference between Autoaqua's Lite G2 and Duo G2 ATO? I comparing their marketing spiel on their website and all the features seems the same. The only difference is the Duo have the added audio and LED light warmings to let the user know whats wrong. Are there some other hidden feature with the Duo I dont know of to justify more than double the cost of the Lite or thats pretty much it?