You should know: About Pain First, check if there are lumps in the breast or is the nipple chapped? It is suggested to use the automatic gear first. And press slightly to connect the breast to the lowest position. In addition, it is recommended that the sucking time should be in 15 minutes better. About Leaking milk First, check the posture if it is right. We suggest that moms should sit down and lean forward 45 degrees when using the pump. Besides, keep the container upright after sucking to prevent the milk leak out from the pump. Note: 1. The default working time is 30 minutes, beyond which the breast pump will automatically shuts down or touch the power button to turn off the power. 2. It can not be charged over 24 hours, otherwise it will be damaged easily. 3. Press level + or - : If the indicating light flashes for once, it means level change successfully. If the indicating light keep flashing,it means it is the lowest level (level 1) or highest level (level 9). 4. There is a small hole in the top of the suction cup for pouring the pumped milk. (As picture shows) Specifications: Brand: YOUHA Quantity: 2 Sets Color: White Material: Silicone + ABS + EPM Mode: Massage, Express, Mixed Adjustable Level: 9 Levels Each Mode Noise: about 45~50dB Input: 5A 1A Battery Indicator: Green (31%-100%), Orange (11%-30%), Red (1%-10%) Built-in Battery: 1 * 3.7V 1100mAh Lithium Battery Cup Capacity: 240ml / 8oz Cup Diameter: 11.5cm / 4.5in Motor Size: 8 * 6.8 * 3.5cm / 3.1 * 2.7 * 1.4in Item Weight: 252g / 8.9oz Package Size: 17 * 15 * 11.5cm / 6.7 * 5.9 * 4.5in (each set) Package Weight: 657g / 1.45lbs (each set) Package List: (package includes 2 sets) each set: 1 * Pump Motor 1 * 240ml/8oz Cup 1 * Silicone Breast Shield 1 * Membrane 1 * Silicone Connector 2 * Duckbill Valve 1 * USB Cable (Type-C) 1 * User Manual (English)