Is My Passport External HDD format 2.5”? Technical resources

Please indicate to me a documentary source “wd” (specifications, brochures, technical data sheets), in which to appear distinctly the specification that the external HDD My Passport is format 2.5 “, respectively My Book is format 3.5”. Marketing materials do this, I want technical specifications, preferably WD. Thank you.

You can check the WD My Passport dimensions: