Study to Evaluate the Contraceptive Efficacy/Safety of a Low Dose EE/LNG Transdermal Contraceptive Delivery System

Inclusion Criteria: Healthy females * 17(in states where the legal age of consent to receive contraceptives is 17)-40 years * Regular, consistent menstrual cycles between 25 and 35 days * Sexually active women requesting birth control * In good general health, confirmed by medical history, physical (including gynecologic) examination and screening laboratory values Exclusion Criteria: * Known or suspected pregnancy; * Lactating women * Significant skin reaction to transdermal preparations or sensitivity to surgical / medical tape * Any disease that may worsen under hormonal treatment (cardiovascular, liver, metabolic) * Use of other contraceptive methods than study medication