The Great Saiyaman Watch is a device used to instantly change into the Great Saiyaman costume. Bulma designs both the watch and the costume within only two hours of Gohan's request. He wants it to help fight crime in Satan City while still keeping his identity a secret. Videl later acquires her own watch to turn into Saiyawoman (or Saiyaman II) to fight alongside Gohan.
- The watch is a reference to devices commonly used by Japanese superheroes to perform their henshin-transformations (like the transformation devices in Kamen Rider and Super Sentai)
- The Great Saiyaman Watch is also similar to the ring where the DC Comic superhero Flash hides his costume.
- It is also like the watch Ultra Spiderman uses to instantly change his costume.