HC-12 SI4463 Wireless Serial Module Port Microcontroller 433Mhz Max 100MW 1000M Distance Replace Bluetooth DC 3.2v-5.5V Power supply voltage : 3.2 V -- 5.5 V.(if the modules working long hours in emission state, suggested that when the power supply voltage is greater than 4.5 V , you need concatenating a 1N4007 diode to avoid module built-in LDO got fever) Default communication distance : about 600 m (communication distance is adjustable up to 1000 m, air baud rate 5000 BPS). Default idle current: 16 ma (modules in different working mode of different current). Module size: 27.8mm*14.4mm*4mm. Operating frequency range (433.4 473.0 MHz, as many as 100 communication channel) maximum 100 mw fired power (can be set) Module supporting software upgrades. Default factory Settings: working mode FU3, baud rate 9600 BPS, communication channel CH001 (433.4 M) Package Included: 1 x 433Mhz HC-12 SI4463 Wireless Serial Port Module 1000m Replace Bluetooth TOP