Features:

• 4 SPDT Relay channels (7A 250V,12A 120V,10A 125VAC, 10A 28VDC).
• Power supply:12VDC 2AMP
• Current consumption: 1A.
• LED indication for relay & power supply.
• Design based on highly proven IC ULN2803 as driver.
• Node MCU Firmware updated.
• High-quality PCB FR4 Grade with FPT Certified. 

ESP8266 Features:

• SDIO 2.0, SPI, UART
• 32-pin QFN package
• Integrated RF switch, balun, 24dBm PA, DCXO, and PMU
• Integrated RISC processor, on-chip memory and external memory interfaces
• Integrated MAC/baseband processors
• Quality of Service management
• I2S interface for high fidelity audio applications
• On-chip low-dropout linear regulators for all internal supplies
• Proprietary spurious-free clock generation architecture
• Integrated WEP, TKIP, AES, and WAPI engines