HC-12 SI4463 433MHz Wireless Serial Port Module is a long-range wireless communication module that uses the 433 MHz ISM band to transmit and receive serial (UART) data over distances of up to 1 kilometer or more (under ideal conditions). It is not WiFi — it's a radio frequency (RF) module, similar to LoRa or RF24 modules, but easier to use for simple serial communication.
Frequency Band:433.4 – 473.0 MHz (configurable)
Communication Type:UART (TX/RX, Serial)
Range:Up to 1000+ meters (line of sight)
Chipset:Silicon Labs SI4463
Data Rate:500 bps to 115200 bps
Power Supply:3.2V – 5.5V
Antenna Required:Yes (typically included with the module)
Working Modes:Transparent, Command, Sleep, etc.