The Downgrade module is specifically designed for RaspberryPi Module B+. As we know the Module B+ has more GPIO that resulting in some of the original for accessories that may not be used on Module B+. So, the Downgrade module can make the accessories for Module B used on Module B+.
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Power LED on board
Compatible with Raspberry Pi A+, B+/2.
Raspberry Pi Module B+ connection port
Raspberry Pi Module B connection port
Extension GPIO port