2.1mm Power Jack 12V DC (Center Positive) 500ma 5VDC Switcher ...

I/O Connectors

GND GP7

GP6

GND GP5 GP4

GND GP3 GP2

Relay Status LEDs

Arduino Nano Port

GND

SPDT Relay Port

+5V 400ma SDA

I²C Output to Next Device

SCL

12V DC Power Connector

2.1mm Power Jack 12V DC (Center Positive)

Address Jumper

500ma 5VDC Switcher Power Supply

Power LED

CONNECTOR PINOUTS FOR 20A SPDT RELAY Relay Warranty Rating: 20A@250VAC 20A@30VDC Coil: 12VDC