Onboard mature and stable ESP32-WROOM-32E module, capacity 4M Flash;The I/O port of the ESP32 module and the UART download port are all drawn out to facilitate secondary development;Onboard ESP32 module IO0 programmable button and reset button;ESP32 supports the use of IDE development tools and provides reference programs in the development environment;Onboard 8-way 5V relays, output switching signals, suitable for controlling loads with operating voltages within AC250V/DC30V; onboard 1 programmable LED and relay indicator.Type: modulePower supply voltage: DC5V-30VMaterial: PCBcolor: blueSize: 148 x 79.8mmPackage Contents:1 x Relay Module2 x 10 Double Row PIN1 x 6 Single Row PINOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.