Designed to be unfastened or disconnected without damage.
Pique and linen also accented several coats and oftentimes were both detachable and formed an overcollar covering a collar made from the coat fabric.1967, Ann Helen Stroup, An Investigation of the Dress of American Children from 1930 Through 1941 with Emphasis on Factors Influencing Change, page 195:
Any device that is designed so that it can be detached from something else.
For the past few months, the red HP Pavilion X2 10-n055na has been my pick of the detachables at £249.99.2015 November 5, Jack Schofield, “Which laptop should we buy for our child?”, in The Guardian: