The Blushy SAO takes accessories in the form of eSAO hats. The eSAO (even Shittier Add-On) "connector" consists of three pins with standard breadboard spacing (0.1"), with the center pin offset slightly on the host side to improve retention. From left to right, eSAO sports a data pin, 3.3V power, and a ground pin. Feel free to design around it!
All the SAOs
SAO, short for "Shitty Add-On", is a pseudo-standardized connector specification for electronic conference badge add-ons. Here are a few of ours.