TRUMOM ELECTRIC is the most advanced electric pump with unique 3 phase expression designed for faster let down and milk flow. It works on baby’s natural suckling action. Start with our unique “Massage Mode” to make the breast tender followed by “Stimulation Mode” and finally “Expression”. Massage mode is designed to increase the milk flow. Use the pump multiple times a day (example 3 to 4 times a day,) to also help the body produce more milk. The product is designed for everyday electric pumping. FLANGE SIZE OF PUMP IS 24MM. The product is light enough to be carried around and can be used with 4 AA batteries or adapter that is included with the pack. TRUMOM is very comfortable to use, pain free and leak free ! All plastic parts used are 100% BPA free and very safe for your baby. The massage mode is really a useful feature. An excellent option for working mothers, TRUMOM is a simple gadget that makes life more comfortable. It ensures that your newborn has access to your milk even when you are not around. No mother should deprive her child of her own breast milk.