A watch band deployant, also referred to as a butterfly or sliding clasp, secures a watch on your wrist. A deployant clasp is typically fancier than a standard buckle clasp. It's available on most metal watch bands. To put the watch on or remove it, you must open the deployant.
Unlock the clasp by lifting up on the watch band deployant clasp.
Pull out the watch band on both sides of the clasp so the clasp unfolds and expands. The watch now may be removed or placed on the wrist.
Lock the wrist band deployment by folding the top half of the clasp over the bottom half of the clasp. Snap the two pieces together so they lock.