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20DB Wireless Serial Port Transceiver Module RF 2.4G PA IPEX Antenna UART TTL RS232 for Ardiuno - $38.20

2x 20DB Wireless Serial Port Transceiver Module RF 2.4G PA IPEX Antenna UART TTL RS232 for Arduino Raspberry pi

ESP8285 chip - $3.50

ESP8285 chip

ESP32-WROOM WiFi & Bluetooth Dual-Core MCU Module - $12.70

NRF24L01+ Module 2.4GHz transceiver - $4.50

NRF24L01 is basically a wireless transceiver, which is used to send and receive data by using radio waves.

nRF24L01+PA+LNA Module – Long Range 2.4GHz Wireless Transceiver (1000m) - $7.50

An upgraded version of the classic nRF24L01 module, integrating a Power Amplifier (PA) and Low-Noise Amplifier (LNA) to extend wireless communication range up to 1000 meters under ideal conditions . Operating in the 2.4GHz ISM band, it is the ideal choice for projects requiring reliable long-distance wireless communication, such as remote sensing systems, robotics, and drones.