CLINICAL TRIAL / NCT06382272

Inclusion criteria: * 18 years of age or older * Scheduled for bilateral mastectomy with two-stage (tissue expander) reconstruction at UCM * Bilateral mastectomy for unilateral in situ or T1 (<2 cm), N0 (no lymph node involvement) breast cancer or breast cancer risk reduction due to known elevated breast cancer risk. (Note - 19-34% of women choosing mastectomy for small unilateral breast cancer elect bilateral mastectomy.)40 We will enroll from this cohort. * Agrees to have breast tissue expander removed within 12-20 weeks of implantation. * Has access to a cell phone and willing to provide the research interviewer with the cell phone number * Agrees to receive text messages from the study * Able to speak and understand English or Spanish * Able to participate in the informed consent process Exclusion criteria: * Requires breast radiation * Single stage mastectomy and reconstruction procedure * Clinical evidence of bilateral breast cancer * Clinical evidence of lymph node involvement * Prior history of mastectomy or other major breast surgery * Prior history of radiation to the chest area (e.g., mantle radiation for Hodgkin's disease) * Prior history of injury (e.g., trauma, surgery, burn) that the participant perceives to have had an effect on the sensation of the breast * Pregnant or intending to become pregnant during the study period * Pacemaker, defibrillator or other implanted electrical stimulation device that may be affected by the implanted electrodes * Complex regional pain syndrome or other pain syndromes or a history of a neurologic condition like multiple sclerosis, degenerative neurological disease, cognitive impairment or dementia * Uncontrolled diabetes * History of poor wound healing or chronic skin ulcerations * History of uncontrolled infection or active infection at time of consent * Expectation that MRI will be required while the devices are implanted * Inability or unwillingness to follow verbal instructions and comply with study procedures * Untreated or poorly managed physical or mental health condition that may pose additional risk according to clinical judgment of the patient's breast surgeon or surgeons * Unwillingness to undergo psychological evaluation to determine study eligibility, if requested or required by surgeons or investigators