Includes: double electric breast pump, (2) tubing, (2) backflow protectors, (2) duck bill valves, (2) collection bottles and caps, (2) standard 24 mm size flanges, AC adaptor, product manual (mpcs.mckesson.com)
A special note: Valves (either a little white duck bill or little white flap attached to a yellow connector on your pump) are key here. (emeralddoulas.com)