Both IoTPi 4 and 6 Channel Boards come with an onboard RP2040 micro-controller, ESP8266 Wi-Fi module, 4/ 6 relays, Isolation Power Supply, and Isolation Photocoupler. Additionally to these, the 4-channel IoTPi board also has an AC/ DC Convertor. IoTPi 4 and 6 channel hardware is an industrial board that can manage up to 4 and 6 appliances/ devices respectively on the load of photo-coupling isolation Optocoupler EL357NC, allowing users to securely regulate high voltages or current. IoTPi smartens appliances while allowing customers to control them via the PiRelay software on their electronic devices. Kit Content:1 x IoTPi Board