Premium-Grade Standby Generator •Designed for luxury homes & small commercial buildings •Runs off natural gas or LP fuel supply Quiet-Test •Low-speed exercise mode for quieter weekly tests; 61 dB @ 23\' Multi-Lingual Evolution •Two-Line LCD Display provides service & maintenance intervals Automotive-Style Engine •Operates at half the speed of other engines (1800 vs 3600 RPM) •Powerful Generac in-line 4-cylinder liquid-cooled engine Sound Attenuated, Acoustically Designed Aluminum Enclosure •Corrosion-resistant material ideal for salty air conditions •Lockable, external viewing window for quick status check Automatic Shutdown Safety Feature •High coolant temp, low coolant, low oil pressure and overspeed Mobile Link (Sold Separately) •Easily check generator status via computer, tablet or smartphone Transfer Switch (Sold Separately) •Customize your system based on your actual application