Onan 4.0CCK 4000 watt generator.  This is one of the great older Onans that runs at 1800 rpm (half speed of most generators).  This has the cast iron engine and is a very heavy duty generator.  Runs perfect and is very quiet.  Electric start.  Currently setup for 120 volt only to run our camper AC. Can also be wired for 120/240.  Easily runs our large camper AC.  This is rated for 4000 watts continuous use not peak like the cheap throw away gensets.  Works great for power backup for our house during storms. Starting battery included.  4.0CCK 3CR/12018R