The invisible breast pump is small and lightweight to place inside your bra. Hands-free, more enjoyable and discreet way to express breastmilk. 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: Nipple Part Diameter: 24mm/ 28mm (Optional) Quantity: 1 Set/ 2 Sets (Optional) Color: White/ Light Pink(Optional) 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 Each Item Weight: 252g / 8.9oz Package List: (Each set includes the following) 1 * Pump Motor 1 * 240ml/8oz Cup 1 * Silicone Breast Cover 1 * Membrane 1 * Silicone Connector 2 * Duckbill Valve 1 * USB Cable (Type-C) 1 * User Manual (English)