The Omnitrix is a fictional device from the animated series Ben 10. It allows the wearer, primarily Ben Tennyson, to transform into various alien species, each with unique abilities. The device is shaped like a wristwatch and features a green and black design, making it easily recognizable. The Omnitrix was created by the alien scientist Azmuth to promote understanding between different species. It contains the DNA of numerous aliens, enabling the user to access their powers. The device also has a safety feature that prevents the user from transforming into certain aliens under specific conditions.