Not very functional
Because the battery pack is on the top it’s very hard to see whether your nipple is lined up In the centre of the pump. They say you can put it on upside down and then rotate it But by the time you rotate it, it could have moved positioning. Getting the milk out of the pump is messy & impractical. I also don’t think the pumps are as effective with milk production. The one good thing is that they are handless/wearable. However, I find my handheld pump to be more effective at extracting milk, easier to position & easier to clean & easier to pour milk into storage bags/bottles. For the price you pay, I just don’t think it’s worth it.