YF-RX*1 is **5/**3MHz ASK RF superheterodyne receiver module. Nice performance at high sensitivity and stable frequency. It is compatible with all our AM transmitter modules such as YF-TX*1, YF-TX*2, and YF-TX*3. Easy to use with external components for applications: Wireless security systems, Car alarms, Remote gate controls, remote sensing, Data communication, Remote water/electric switch, Pager system, PDA data communication.