The kit includes a pair of transmitter and receiver modules and a pair of spring antennas to increase the communication distance. And the frequency is 315 MHz. It is very popular in remote control systems, such as remote control gates, smart cars, smart homes, etc. About the transmitter module (square shape): - Compatible with Arduino; - Arduino library: VirtualWire; - Operating voltage: 3.5 ~ 12V DC; - working frequency: 315 MHz; - Transfer rate: 4 KB / s (max); - Transmission distance: 3 m (maximum) at VCC = 5 V without additional antenna. When the spring antennas are welded to the transmitter and receiver module, the transmission distance can be increased to 5 meters. The supply voltage is greater, the transmission distance further.
