Fasizi 5PCS 433MHz RF Wireless Transmitter and Receiver Module Kit for Arduino Raspberry Pi

VCC voltage module operating voltage and good power filtering Great influence on the antenna module reception, preferably connected to the 1/4 wavelength of the antenna, typically 50 ohm single conductor To increase the reception range, consider using a copper wire to the XY FST solder / plug at the contact point ANT. These modules are used for projects when you need to communicate wirelessly between 2 devices. It is possible to increase the range by adding a small length of cable which the device will use as an aerial.