dngr.us/xac - The xEM Access Controller v2 is a new version of our 125kHz LF access controller. It can store and authenticate 50 separate 125kHz EM tag IDs (our xEM, flexEM, or NExT implantable products), and activate an on-board SPDT relay on authorized tag scan. You can also set the relay activation time to either 1 second or 5 seconds. In addition to that, with settable master programming tags, you'll never lose your master tag and you'll be able to synchronize your master programming tags across multiple access controllers!