The remote control RADIUM R1 - R2 - R2T - R4 is a 1-2-4 buttons key chain style transmitter, operating at 433,92 MHz. It has been designed for the control of automatic closing systems and anti-burglar systems, thanks to its very high security coding system (KeeLoq® Hopping code). The code sent by the transmitter changes at each activation, avoiding any scanning and copying risk. A special algorithm allows to keep synchronized transmitter and receiver. The transmitter can be equipped with passive tag ( see table for the reference ) The CR 2016 lithium batteries of the transmitter have a shelf life of about 6 months. The product fully complies with Part 15 of FCC Regulations and the European Directives 2006/95/CE, 2004/108/CE, 99/05/CE.