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How to use: Press the power switch then enter the 90 seconds secrete mode, the system will increase sucking strength gradually until the acquiescent strength. Mothers can press plus sign and minus sign to adjust the suitable strength. Press the mode button and the mode can be changed, red light on while massage mode, green light on while milk sucking mode. There are 18 modes of milk sucking, when long press plus sign or minus sign, red light or green light long flickers when the setting reaches the highest or the lowest gears. This breast pump can use the input AC: 220 V; 50 HZ ; DC 5 ; 1 A power output of the phone with a usb interface adapter , computers , mobile power