HC-12 433 SI4463 Wireless Serial Module

HC-12 is a long-distance wireless transmission with the range of 1,000m in open space/baud rate 5,000bps in the air.
Key Features

Working frequency range is 433.4-473.0MHz, up to 100 communication channels

Maximum 100mW (20dBm) transmitting power (8 gears of power can be set)

Built-in MCU, performing communication with external device through serial port

The number of bytes transmitted unlimited to one time

Update software version through serial port

Datasheet