USB-powered, USB transmission interface, multiple power supply modes, power supply anytime, anywhere, use breast pumps anytime, anywhere. 2 modes (pumping mode and massage mode), 9 levels for suction mode. The massage mode helps push milk out of your milk ducts and reduce breast discomfort. You don't have to worry about the milk damaging the machine. The backflow prevention function prevents milk from entering the breast pump and keeps the milk clean. The ultra-quiet technology creates gentle vibration and a low noise atmosphere below 45 dB; the maximum suction power is up to 350 mmHg. It is small, lightweight, and can hold 150 ml of milk. Simply put it in your bag and carry it with you. Function: 1. Anti-backflow design: Closed system with overflow protection. Prevents your breast milk from entering the tube and motor. 2. Easy to clean: Fewer parts need to be cleaned and assembled, saving assembly and cleaning time. 3. Ultra-quiet: The ultra-quiet design won't disturb anyone around you when you express breast milk. Let the baby sleep peacefully. 4. Single/Double Pump: Feel free to choose the combination you like. Easy to connect and operate, you can put this electric breast pump in your bag and take it anywhere. 5. Breastfeeding Kit: 150ml bottle with detachable nipple. The cap and sealing washer are specially designed to prevent the bottle from leaking. Portable and more convenient. 6. 3D Soft Silicone Massage Cushion: The soft flower petal cushion massages the areola, sucking comfortably and painlessly at the breast, and bringing a warm feeling, like a baby's sucking. Specifications: Material: PP, Silicone Rated Voltage: 5V/1A Bottle Capacity: 150ml Packing List: 2* Breast Pump 1* Main Unit 2* Loops 1* Pacifier 1* Data Cable How to Use It Step? Step 1) Please clean and sterilize all parts (except the breast pump body) before use. Step 2) Connect the USB transmission interface; household power adapters, notebook computers, mobile power adapters, and computer hosts can all be used. Step 3) Please sit on a chair and massage your breasts with a warm towel. Step 4) Please ensure that the breast shield is directed towards your nipple and tightly adheres to your breast. Step 5) Please press the power button to turn on the power. Note: 1. Wash your hands before using a double electric breast pump for milking. 2. Breasts or nipples should stop milking if they feel pain. 3. Do not put refrigerated breast milk and fresh breast milk together. 4. After the thawed breast milk is thawed, your baby cannot finish drinking it; please do not repeat the refrigerated breast milk.