【4 Modes , 12 Suction Levels】The wearable breast pump supports 4 modes(Massage Mode/ Sucking Mode/ Expression Mode/ Expression Mode with different speed), and each mode has 12 adjustable suction levels. Mothers can find a suitable suction level easily for efficient pumping. 【Built-in Battery , Low Noise Working】Built in 1100mAh rechargeable battery, long working time and can be charged by the included USB cable quickly. The sound of the wearable breast pump is less than 40dB during working, which will not disturb your baby or get others attention. 【Anti-Backflow , No Leakage】Adopts anti-backflow design and a seal system, wearable breast pump can prevent the breast milk from being contaminated and leakage. The breast shield can store 180ml milk. 【No Pain , Fits Well】112.2mm breast shield is suitable for most breast size, and made of soft silicone material, which will not cause pain and maintain a good seal. Compact and lightweight, can be put into backpack for convenient carry. Specifications: Material: PP and Silicone Breast Shield Diameter: 112.2mm Storage Capacity: 180ml Modes: 4 Suction Level: 12 Battery Capacity: 3.7V 1100mAh Charging Port: Type-C Charging Voltage: 5V Charging Time: About 2H Battery Life: About 1.5H after being fully charged Item Weight: 242g/ 8.5oz Packing List: 1 * Breast Pump 1 * Charging Cable