From the seller

Efficient】: This hands free breast pump is designed to efficiently emptying of breastmilk in 15 minutes, no rise, no blockage and more milk. 【Adjustable Suction】: ROMO-GLE/21 wearable breast pump has 3 Modes and 8 Suction Levels, you can customize the suction strength to your comfort level for a comfortable pumping experience 【Hygienic & Safety】: The electric breastfeeding pump features closed system to prevent milk backup and split-to-clean components with food-grade material 【More Accessories】:ROMO-GLE/21 wearable breast pumps include a 27mm silicone sealed flange, 3 x Flange Inserts (19/21/24mm), 2 Duckbill Valves, 1 Nipple Ruler, and a silicone cover who can seal the collection cup up 【Versatile & Convenience】:The portable breast pump has a smart screen, you can choose the mode and the level easily by 4 physical buttons, it designed with compact size with just 262g. The sound is less than 45dB while it works, it can be satisfied with many daily scenes