“Labels all Pins in BCM Pin Number (GPIO) and also Physical Pin Number. Also marks out some special pins, such as 5V, 3V3, GND and the HAT EEPROM IВІC Pins. I wish it marked out Pins such as TXD, RXD (UART) and SPI, IВІC but I guess there is a limited amount of space. Can be on the raspberry pi without inhibiting the ability for you to connect things onto the header pins. Does not fit in the official raspberry pi case due to the bottom bit (with the logo) being in the same place as one of the vertical supports. For such a low price, it is a very useful thing to own.”