The Si4463 has better sensitivity (-126dBm) and superior range compared to the Si4438 (-124dBm).
Different batches of HC-12 modules ship with different firmware versions. Chinese clones, genuine NiceRF modules, and unbranded variants often have distinct firmware behaviors—especially regarding AT+VER responses and power-down recall. hc-12 firmware
The HC-12 is a beloved module in the maker community. For less than $5, it gives you a powerful, half-duplex UART serial wireless bridge capable of transmitting up to 1km in open air. The Si4463 has better sensitivity (-126dBm) and superior
