Description: Power supply voltage : 3.3V.(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). 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. The HC-12 module has three serial port transparent transmission modes, which are represented by FU1, FU2 and FU3. FU1: This mode is a more power-saving mode, in which the module's idle operating current is about 3. 6mA. In this mode, the module can also set the 8 serial port baud rates as shown in the table below, but the air baud rate is unified to 250,000 bps. FU2: This mode is the power saving mode, in which the module's idle operating current is about 80μA. In this mode, the module only supports the serial port baud rate of 1200 bps, 2400 bps and 4800 bps, and the air baud rate is unified to 250,000 bps. (After detection, there is a little bug when transmitting data in this mode, and users are not recommended to use FU2 mode for the time being) FU3: The module works at full speed and the idle working current is about 16mA. In this mode, the module automatically adjusts the wireless transmission air baud rate according to the serial port baud rate. HC-12 specification download link: http://www.wavesen.com/downloadDis.asp?id=44 Package included: 2 x SI4463 433MHz Serial Port Module 2 x Antenna 2 x 5pin 2 x 5pin DuPont Cable Female to Female 2 x 5pin DuPont Cable Female to Male