1.You can be confindent because we believe in good quality. 2.have got certificate for ROHS, CE0123, ISO 14001 and ISO13485 Brief Description and Advantage: Detailed Product DescriptionThree mode: PP, PE, EE for choice to improve gastrointestinal motivity and keep healthy. Easy operation, can be used by families or individuals for prevention and cure of disease and for healthcare under the ...