Specification: Item name: Double Electric Breast Pump Suction: - 0. 38kpa Material: Food Grade PP+ Silicone Color: White Milk bottle capacity: Approx. 150ml/ 5oz Milk bottle upper diameter: Approx. 3. 5cm/ 1. 38in How to use: 1. Press the power switch to enter the secretion mode for 90 seconds, it will gradually increase the sucking force until it reaches the default force. Moms can press buttons to adjust it to the appropriate intensity. 2. Press the mode button to switch the mode. Massage mode- red light, scution mode- green light. There are 18 pumping modes, long press the buttons to adjust intensity. Precautions: and all breast pump parts before first use. Thoroughly and before and after each use. When cleaning, remove all parts completely as well as the valve. Be careful when disassembling and cleaning valves.