STM32F042F6P6 MCU with internal oscillator SWD header for easy debugging (not populated by default) Dual USB port (Vertical or Horizontal) with breakout pin header for USB header I2C Screen connections for 1.3inch display with on back for slecting which pins (1 or 2) are power and ground EN11-style click encoder support Reset/kill button 3 GPIO pin header 1 on-board with data line broken out for expansion In addition to the PCB and SMD parts (see ), you need: Encoder(Not included) Kill and Reset Switch 6mm Tactile buttons 4.3mm Tall(Not included) Pin Header Assortment Male -Style and/or JST-XH Style (Can be nice for USB as it's polorized)(Not included) Note: The delivery list of this product does not include the knob, please contact customer service. Color: As Shown Material: plastic Package Contents: 1 x Display Screen Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.