Liquid-cooled generators produce higher wattages for larger residential and light commercial applications. Ultra quiet weekly exercise with the new Whisper Test (TM) feature. Operates on either LP gas (45,000 watts) or natural gas (45,000 watts.) 4 cylinder industrial engine. Sound attenuated, weather protective enclosure for quiet operation.THIS ITEM MAY TAKE 30 - 60 DAYS TO REACH YOUR HOME. THIS ITEM CANNOT BE RETURNED.