This Arduino prototyping shield allows developers to develop add-on capabilities on a 0.1" x 0.1" prototyping grid with large pads. Engineers have an option of either stacking headers or plain headers, and can leverage a pass-thru ICSP stacking header that supports any type of additional shield and/or the use of an AVR programmer. 14 SOIC surface-mount chips are supported, as are up to 20 pins.