1Lot= 5pair (10pcs) 433Mhz RF transmitter and receiver Module link kit /ARM/MCU WL diy electronic kit. 5pair (10pcs) 433Mhz RF transmitter and receiver Module. kit /ARM/MCU WL diy electronic kit. Antenna position has also affected the reception of the module, the installation, the antenna as possible straight away from the shield, high pressure, and interference source; frequency used to receive, decode and oscillation resistor should match with the transmitter.
eBay