They are pin compatible with PIC16F887 and PIC18(L)F45K20 and perfectly fit into standard DIP40 sockets. MINIs operate on 3.3V power supply. On-board voltage regulator allows MINIs to be powered directly from USB cable. Boards are equiped with SMD crystal oscillator, and 32.768KHz crystal which can be used for internal RTCC module. Each one has a reset button and three signal LEDs. They come preprogrammed with fast USB HID bootloader, so no external programmers are needed for development.