|Great Saiyaman Watch|
|Alternate names||Transformation Watch|
|Debut||Manga: "A Hero Is Born!"|
Anime: "I am Saiyaman"
|Similar techniques||Micro Band|
The Great Saiyaman Watch is a henshin-type watch 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 device itself is a reference to devices commonly used by Japanese superheroes to perform their Henshin-transformations.
- The Saiyaman Watch is similar to the DC Comic superhero Flash's ring, where he hides his costume.
- The Great Saiyaman Watch functions are also very similar to those of the morphers of Power Rangers