Transmitters, operating in the infrared range (infrared).
A set of two backlight modules, equipped with IR LEDs 850nm 3W. On the boards there are photoresistors that allow you to adjust the light depending on the brightness of the surrounding, the radiation angle is 100°.
Module with ESP8266 system and IR transmitter and receiver enables control of IR devices via wi-fi. Wi-fi module can be programmed to provide an interface between HTTP, MQTT, TCP, and devices controlled via IR. ESP8266 has 4 MB of flash memory, and a PCB antenna.