HC12 Long Range 1Km Serial Transceiver Module (Original) is a high power, long range and easy to use RF wireless transceiver module based on the popular SI4463 IC. It works at the 433 MHz comes with an external spring antenna and can work in ranges up to 1000 meters (requires stable power supply, low data rate and low surrounding interference with line of sight). HC-12 wireless serial port communication module is a new-generation multichannel embedded wireless data transmission module. Its wireless working frequency band is 433.4-473.0MHz, multiple channels can be set, with the stepping of 400 KHz, and there are totally 100 channels. The maximum transmitting power of module is 100mW (20dBm), the receiving sensitivity is -117dBm at baud rate of 5,000bps in the air, and the communication distance is 1,000m in open space.