Power Supply Voltage: DC 5V or USB;
Input/Output Voltage: DC 3.3V ^^ On-Board 5V 1A Switching Power Supply ^^ All I/O Pins Have Interrupt, PWN, I2C and 1-Wire (Except D0) ^^ Designed with Ultra-Low Power Technology, It Offers the Full Range of Performance and Features Same As the ESP32 Chip ^^ ESP32 D1 Mini Development Board Can be Programmed for the IDE and Support OTA Online ^^ ESP32 D1 Mini Board has a Similar Pin Layout with the D1 Mini ESP32, Therefore Pin-Compatible with Most Accessories