The wearer on their turn can use their action to turn invisible for as long as they can hold their breath (Constitution modifier +1). Stealth +4 while worn.  If the wearer cast's a spell or makes an attack that requires verbal components then the wearer becomes visible for a moment and as a bonus action can turn invisible if they haven't already used their bonus action that turn. The wearer can go in and out of invisibility using their bonus action  for 1 hour unless the wearer casts a concentration spell. This ring can be used a number of times per day equal to your constitution modifier +1.