Arduino Prototype Shield - Type A

Green Power LED.
User - Red LED 3-5V.
User - Blue LED 3-5V.
User - Push Button (active low).
Prototyping Area. Headers compatible with 8 digit MAX7219 displays.

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Arduino Prototype Shield - Type B

Green Power LED.
User - Red LED 3-5V.
User - Blue LED 3-5V.
2 x User - Push Button (active low).
Large Prototyping Area.

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Arduino Prototype Shield - Type C

Arduino prototyping shield that fits the popular Arduino UNO.
The board has a large (0.56") 4 digit LED display, a rotary encoder and a speaker for alert tones.

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Arduino Prototype Shield - Type D

Arduino prototyping shield that fits the popular Arduino UNO.
The board has 4 digit (0.36") LED display and 4 push buttons.