RS485 ESP32 Din Rail Mounting Expansion Board DC 7-30V Power Input 5V 3.3V Outpu S$ 12.06 to S$ 16.07
4-8CH Relay Pluggable Modbus Remote IO Module Baud Rate Slave ID Dip Switch Sele S$ 20.58 to S$ 34.19
433MHz DC 12V 2Channel Multifunction Wireless Controller Timer Delay Relay Modul S$ 16.09 to S$ 64.35