This was the pump recommended to me in the maternity hospital. I found it really helpful and effective to use. This is the information on it from the website: For breastfeeding and expressing mums on the go, the Calypso Double Plus Electric Breastpump ensures complete mobility, discretion and performance at all times. Based on hospital grade technology, the Calypso is a quiet and compact closed system that features innovative phase 2 technology that reduces pumping time by 50% while increasing milk production and stimulating the acceleration of the let-down reflex. With 64 combinations of settings for the adjustment of vacuum and cycles, the pump is designed to meet both the mother and baby’s needs at all times. Key Features : Offers a compact, hygienic design with a reduced sound level for optimal discretion Provides 64 combinations of settings for the adjustment of vacuum and cycles while enabling sensitive adjustments during the stimulation and pumping modes The Calypso Double Plus Electric Breastpump can be either mains or battery operated for flexibility of use Delivers a 'vacuum seal' technology that protects the unit from contamination and pathogenic agents Features MicroSens electronics that ensures accuracy and provides a large clear and easy to read LED display All Ardo breastfeeding products are manufactured in Switzerland from material free from BPA