The Arduino Sensor Shield allows you to connect to various Analog or Digital modules like sensors, relays, buttons, potentiometers. The plethora of header pins simplifies wiring and interfacing of both analog and digital sensors and devices.
Another advantage of the sensor shield is that the interfaces are standard and labeled - meaning you don't need to spend time figuring out how to attach your sensor to the Arduino - just figure out how to read the incoming sensor data in the software. This board gives you easy access to all of the digital, analog and I2C/Uart interfaces on the Arduino UNO with pin headers or connectors.
This shield has specific breakouts for an SD Card reader, a Bluetooth module, an ultrasonic sensor and ICSP. It also has a reset button and a power LED.
This item is just the Arduino Mega Sensor Shield. No additional shields, power supplies, cables, software or other accessories are included. Vetco sells an ever increasing selection of Arduino shields and Arduino sensors.