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Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards, Jetson Nano High quality relays, loads up to 5A 250V AC or 5A 30V DC;Photo coupling isolation, prevent interference from high voltage circuit Standard rail mount bottom case;Onboard LEDs for indicating relays status Relay control pin selection jumper, allows to control the relays by custom pins other than the default pins; Reserved control Interface, allows to work with controllers like PLC Comes with development resources, including examples in wiringPi, bcm2835, python, python-bottle (webpage control), and crontab (cron job),development resouces: www.waveshare.com/wiki/RPi_Relay_Board_(B)