Whisper 3.5 / 3500
You are in possession of a Whisper 3.5 / 3500 . Mastervolt's basic version, and one of the most popular generators.
Generators made before 2004 are called the 3500 series , after 2004 the generator became a 3.5 . To see what type of generator you have you can look for the part- and serial number on your generator.