ITEM NAME:1Pcs 433Mhz HC-12 SI4463 Wireless Serial Port Module 1000M Replace Bluetoot V1A8 1Pcs 433Mhz HC-12 SI4463 Wireless Serial Port Module 1000M Replace Bluetoot V1A8 100% brand new and high quality 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). Mini size,only 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) Material: Metal Package Included: 1X HC-12 SI4463 Wireless Serial Port Module Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..1X HC-12 SI4463 Wireless Serial Port Module. Module supporting software upgrades. Default idle current: 16 ma (modules in different working mode of different current).