asy to Use . Placed under bra, no need to hold . Compatible with other breast pumps . Ergonomic design for comfortable feeling . Safe to Use . Back flow prevention . Hygienic – easy separation and assembly . BPA free – safe to sterilize with boiling water, UV light . [ Composition ] . Breast shield set, Flange, Duck valve, Backflow protector, Milk storage bottle, Tubing . Our hands-free breast shield set allows for more convenient and comfortable pumping. The hands-free breast shield offers extra convenience to busy moms to be able to express their milk while attending to other activities. It also avoids the hassle of being tied down and having to change to pumping bra in order to be hands free. The hands-free breast shield fits easily onto the bra allowing you to enjoy other activities as you express. It also allows for compatibility with our complete backflow protection system. Our hands-free breast shield set does NOT compromise the suction and effectiveness of the pump. The other unique feature of this set is the collection of milk occurs in the bottle which allows for not losing any amount of milk which was one of the challenges with other like products on the market. Another restriction of like products was the amount collected was limited, so if you were an over-supplier it was hard to collect large amounts of milk without emptying contents, this allows for the freedom to collect as much milk as our bottle holds (5 ounces). You can use any narrow neck bottle to attach directly to the shields. This customization allows for hands free with NO limits. Closed Complete Protection System | User friendly for easy and comfortable pumping | Easy cleaning .