product features: 1. this product is designed, with an transformer, to be suitable for 110V US standard and 230V European standard AC, and two batteries DC too. 2. it can eliminate effectively the tiredness of manual operation. 3. electric power insure steady, Strong Suction. 4. user can customizer most comfortable suction simply. 5. considerate design to be easy to assemble, operate and clean: mom can control and choose their favor suction speed just by turning the adjust ring or the button; 6. with a bottle neck adaptor, it is suitable for every kind of feeding bottles of varies sizes. 7. its silica gel pad which has massage function makes it easy to suck out a great deal of breast milk in a short time, and also can eliminate the gall and ache of the breasts during the feeding period. 8. eco-friendly Material: PP, PC, silica gel, resin of ABS ( machine body), be Safe, comfortable, hygienic, don't comprise poisonous chemic material