Features: This is a metal case- kit for 4B Only. It contains a GPIO terminal board which can expand the GPIO to terminal and with the 40Pin cable wire socket outside the case- With the LED indicator can shows the GPIO working status during the GPIO Pin working. For 4B GPIO light board expansion board and shell kit. Note:for 4 board is not included! Specifications: Item:Metal Case- Kit For GPIO Board Expansion Board Size:approx 88x62x33mm/3.46x2.44x1.29in Material: Metal Note: for 4 board is not included! Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Package includes: 1 x Metal -Case 1 x Terminal Expansion Board with LED indicators 1 x Screw Driver 1 x Terminal Pinout Sticker 4 x Copper Pillars 4 x Screws 4 x Aluminum Heatsinks