The Danger Shield contains a variety of fun and useful electronic circuits that you can use to do fun and useful things with Arduino. It is a fully self-contained shield. You plug it into your Arduino, and you can immediately start using it. No extra things to hook up, no external components.

Some of the features of the board are:
3 x linear sliders w/ integrated LEDs (each independently hooked up to PWM)
3 x pushbuttons
2 x indicator LEDs (each with a PWM)
1 x piezo buzzer (for making noise!)
1 x temperature sensor
1 x light sensor
1 x knock sensor
1 x 7 segment LED (with shift register)
Power LED and reset button

See also wiki.nycresistor.com/wiki/Danger_Shield_1.0

Arduino Seeed Studio Danger Shield Pinouts