RecruitingDevice studyPlexaa For Preconditioning: Gender Affirming MastectomyThe goal of this clinical trial is to evaluate the use of the Plexaa preconditioning device (BLOOM43) in transgender and non-binary patients undergoing gender affirming mastectomy. This study aims to understand a participant's experience of the device, including its usability and acceptability. Participants will use the device to precondition their right breast the evening before undergoing surgery (gender affirming mastectomy).