Features: Made of food-grade plastic and silicone, safe to use for both mom and baby. 4 working modes (frequency suction, expression, suction, simulation), each mode has adjustable 9 levels. Easy to assemble, and the components can be cleaned and disinfected in boiled water or steam except the motor. With LED digital display easy to check the working status at a glance. Ultra-silent technology which creates an atmosphere of low flow vibration and low noise. One-way flow, no reverse flow. Anti-reflux design, reduce pollution, more hygienic to use. Built-in 2000mAh large capacity lithium battery, suitable for working, travelling and more. Specifications: Material: ABS + PP + Silicone Color: Pink / Blue (Optional) Quantity: Single Side / Double Side (Optional) Type: with/ without Built-in Battery (Optional) Input: 5V Power: 3W Mode: Frequency Suction, Expression Mode, Suction Mode, Simulation Mode Adjustable Level: 9 Levels Each Mode Bottle Capacity: 180ml / 6oz Noise Limit: ≤60dB(A) Motor Protection: Ⅱ Built-in Battery: 3.7V 2000mAh Lithium Battery Item Weight: (with Main Engine) Single Side: 393g / 13.9oz Double Side: 502g / 1.1lb Package Size: 20.0 * 19.2 * 9.7cm / 7.9 * 7.6 * 3.8in Package Weight: Single Side: 579g / 1.3lb Double Side: 703g / 1.5lb Package List: Single Side: 1 * Main Engine 1 * Silicone Breast Shield 1 * Cylinder Head 1 * Diaphragm 1 * Valve Base 1 * Duckbill Valve 1 * 180ml / 6oz Bottle 1 * Nipple with Cover 1 * Dust Cap 1 * Through Joint 1 * Pipe 1 * Charging Cable 1 * User Manual Double Side: 1 * Main Engine 2 * Silicone Breast Shield 2 * Cylinder Head 2 * Diaphragm 2 * Valve Base 2 * Duckbill Valve 2 * 180ml / 6oz Bottle 2 * Nipple with Cover 2 * Dust Cap 1 * Through Joint 1 * Pipe 1 * Charging Cable 1 * User Manual