The Lansinoh Manual Breast Pump is a convenient and portable alternative for breastfeeding women who want to comfortably and discreetly express their milk away from home, without the need for batteries or plugs. Designed for ease of use, a simple button on the top allows you to switch between the two phases: Stimulation: mimics baby's natural sucking style at the start of feeding. Expressing: replicates the longer, slower feeds that baby takes later in the feed.