This applicator bottle for skincare serum uses the extrusion principle of the vacuum pump, allowing the serum to be squeezed out by pressing the bottom part of the bottle. The design of the nozzle is based on the vacuum cleaner attachment you use to clean the folds of the couch. It is also made from silica gel, which means there is little danger of scratching sensitive skin through clumsy application. Best of all, the applicator bottle is designed to be used with just one hand.