Buy on Amazon : http://www.amazon.com/gp/product/B005J039BS?tag=lottalatte-20 <br /> <br />Elk ELK-M1XRFEG Wireless Receiver for GE Crystal Transmitters <br /> <br />Adds up to 144 individual wireless zones <br />Operates from the 4-wire RS485 Data Bus <br />Up to 11 receivers may be connected to a single M1 or M1EZ8 control for redundancy <br />Flash memory allows field updating of operating Firmware
