Welcome to our shop! Features: - Built-in program, no need to pay attention to serial protocol automatic networking. - Support one to multiple interconnection and transparent transmission. - The open environment transmission distance is 1KM. - Operating frequency range (433.4-473.0MHz, up to 100 communication channels) Maximum 100mW transmit power. - The module supports one-to-one, one-to-many, many-to-one, many-to-many connections. Four transparent transmission modes to suit different applications. - Built-in MCU, free of programming, communication with external devices via serial port. - Not limited to the number of bytes sent in a single transmission (FU1/FU3 mode). - Default factory setting: working mode FU3, baud rate 9600bps, communication channel CH001 (433.4M). Specification: - Voltage: 3.2~5.5V (If the module is to be in the transmitting state for a long time, it is recommended to connect a 1N4007 diode in series when the power supply voltage exceeds 4.5V to avoid the built-in LDO heating of the module.) - Distance: 600m (The maximum communication distance can be adjusted to 1000m and the air baud rate is 5000bps) - Default Standby Current: 16mA (The working current of the module is different in different working modes) - Size: 27.8 * 14.4 * 4mm / 1.09 * 0.57 * 0.16in - Working Frequency: 433.4~473.0MHz - Maximum Transmission Wattage: 100mW Package List: - 1*Module - 1*Spring Shaped Antenna 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.