Place frozen chicken breast in a freezer gallon size ziploc bag. Add lemon and lime juice and salt and pepper to chicken. Seal bag, squeezing out all the air.
Fill Sous Vide container with water. Place ziploc bag in water. Insert Sous Vide cooker and plug in. Use phone app to set cooking time. 149° for 2.5 hours.
When the chicken is finished cooking and has reached 165 F internally, melt butter in skillet over medium high heat. Quickly brown both sides of the chicken breasts. Serve.