FEATURES 1.Stimulation Mode and Expression Mode The stimulation mode is in 1-5 adjustable levels with high frequency to stimulate milk secretion.(That should be used before sucking milk.) The express mode is in 1-9 adjustable levels of low frequency with strong suction effectively collect breastmilk. (That should be used after the stimulation mode.) 2.How to use the tube adaptor A.If you want do work with two pumps in the same time, you need switch the button of tube adaptor to the middle position; B.If you want do only with the left or right pump, you need to switch the the button of tube adaptor to the LEFT or RIGHT position. PARAMETERS, Material: PP, PVC; Voltage: 6V; Power: 3W ; Current Rating: 500mA ; Battery Model: AA, 5V ; Rated Voltage: AC 110-230V ; Rated Frequency: 50Hz-60Hz ; NOTES 1. Wash your hands before using the product. 2. While using, please relax your whole body and choose the most comfortable posture to express. 3. Please remember to turn off the electronic pump after finish. 4. Please not continue working more than 10 minutes. PACKAGE INCLUDED Controller x 1 , Breast Pump x 2 , Base Plate x 4 , Bottle Nipple x 2 , Tube Adaptor x 1 , Long Tube x 1 , Short Tube x 2 , USB Line x 1 , AC Adaptor x 1 , User Manual x 1 ,