Usability : For gentle and effective expression of breast milk , One Bottle 2 functions : Feeding Milk + Suction Milk , Easy to assemble,Material : Made with food grade medical silicone, BPA Free ,Phthalate Free , Design : Compact , Light weight , Easy to use , One hand Pumping , Petal shaped bump design for a more comfortable massage , silicone cushion help in giving support to breast , Ergonomic handle shape for better grip.Cleaning : Easy to clean , All parts can be sterilized , It has standard caliber so more convenient cleaning, Other details Manual Massage Breast Milk Pump: Always Sterilize the complete set before and after use. Always sit straight when ever you start pumping the milk. Adjust the pump and put your nipple towards the center of the pump. Squeeze the center of the pump and release it to create a suction to attach the pump to your breast. That's it and let the pump do the rest. Cover the pump with lid to prevent any dust to go in. (Please note that the lid is for covering purpose only and it is not 100 percent leak-proof. ) It is advised to pour the milk into the bottles or storage bags for better storage. Tips - massage your breast with a hot towel before using the pump would help the milk to be released quicker and easier in starting you will feel pain but after 2 or 3 times your breast will get used to it.