Specifications:

• Power Join and Power Isolation Support
• DC powered [ Power in ] DC 9-28V
• DC powered [ Power isolation ] DC 9-28V
• DC Jack Power [default] 5.5 x 2.1mm. Positive Porarity
• Microcontroller Unit : Esp32 devkit v1
• Maximum power consumption [join power and all relay
  in active with Esp32 devkit v1] : ≤2.3W [@12V]
• Port : RS-485 [Auto Direction], Custom Switch with external resistor pull-down
• OLED Display 0.96″ IIC
• Passive Magnetic Buzzer
• Output :  4 Channel Relay 10A
• Board Material : FR-4
• IP54 Enclosure : IMI-PLC-24
• Dimensions 110 x 96 x 43 mm.
• Net. wt. 190 g.