It is a serial port module with a maximum communication distance of 1000 meters, 433.4 - 473.0 MHz, 100mW transmission power.

Technical Specifications: Supply voltage 3.2 V ~ 5.5 V.

(If you want to work for a long time in the case of module start-up, it is recommended to use the LDO internal heating module as a precaution when the supply voltage with 1N4007 diode exceeds 4.5 V series) Default idle current: 16mA Module size: 27.8mm × 14.4mm × 4mm Operating frequency range (433.4-473.0 MHz, up to 100 communication channels) maximum 100 mW transmission power (adjustable) Default factory settings: operating mode FU3, baud rate 9600bps, communication channel CH001 (433.4 M)