The Gentlefeed Duo isa two-channel electrical breast pump. Creates soft vacuum effect and massage gently to the nipple that imitates the baby’s sucking actions. This kit comes with extremely soft silicone liner that contracts during suction, creating a soft massage to the nipple. The classic cup in hard plastic utilizes traditional action of sucking without massage function. It is used to increase the suction effect and comes in 3 sizes Medium, Large and Extra large. Powered by double suction device, two (250 ml container including the lids) ,a thermobag and 2 sleeve cold/hot packs that comes with a useful bag.