Weighing in at only 160 grams, the elegantly designed Spectra Q is about as compact as breast pumping gets. It comes with one set of attachments, but is easily converted into a double pump by adding a second Breast Shield Set and bottle (available separately). The Spectra Q can either be used plugged into the mains via its AC adaptor, or with a power bank via a C type USB cable. (Power bank and USB cable are not included.) The pump’s maximum strength is 300mmHg. You have a choice of five different settings, ranging between 25 and 52 cycles per minute, in expression mode. Let-down mode, or massage mode, also offers you five different options – the lowest being 66 cycles per minute and the highest 108. The back-flow protector ensures that breast milk particles will not cause growth of mould and contamination in the motor unit. All attachments that come into contact with your milk, are BPA free. The Spectra Q comes with a one-year quality guarantee.