Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards. 4-ch monitoring, via I2C/SMBus interface ^^ Onboard 0.1 1 sampling resistor, allows measuring bi-directional current up to 3.2A ^^ Embedded 12-bit ADC, supports multiple successive converting, 0~26V voltage measuring range ^^ Directly calculate and output measured power value through additional multiply register. I2C control pins for connecting with other host boards ^^ Comes with development resources and manual (examples for Raspberry Pi/STM32)