The electric breast pump is pain free it can control the suction and adjust the strength freely. Double Breast Pump. With the T-tube, you can use it as single breast pump or double breast pump for your needs. The sound of the breast pump is only 40-50 decibel which is lower than the voice of normal speech. Portable. It can be connected to the power bank by the USB cable. Thus it is convenient for you to carry it everywhere. BPA Free. Made of PVC raw materials, contains no harmful substances.