2. Mega board has enough pins for using SD card and touch function at the same time.Also, the maximum of 2GB is can be supported.
3. The 3.2 TFT LCD module works in 3.3V voltage level and you need to use cables to connect with for Arduino Mega. And this shield can help you out of the bothers to use other cables. You just need to plug the module to Mega through this shield.
4. It has an adjustable button for contrast of the LCD display.