Raspberry Pi 3.5" Touch Screen

PiTFT - Assembled 480x320 3.5" TFT+Touchscreen for Raspberry Pi features a 3.5" display with 480x320 16-bit color pixels and a resistive touch overlay. The plate uses the high speed SPI interface on the Pi and can use the mini display as a console, X window port, displaying images or video etc.

It's designed to fit nicely onto the Pi Model A or B but also works perfectly fine with the Pi 2 or Pi 1 Model B+ as long as you don't mind the PCB overhangs the USB ports by 5mm.
Uses the hardware SPI pins (SCK, MOSI, MISO, CE0, CE1) as well as GPIO #25 and #24. GPIO #18 can be used to PWM dim the backlight if you like. All other GPIO are unused. There's a 2x13 header on the bottom, you can connect a standard Pi GPIO cable to it to use any of the other pins ask you like.

PiTFT - Assembled 480x320 3.5" TFT+Touchscreen for Raspberry Pi - General Specifications

• 3.5” display
• 480x320 16-bit pixel resolution
• Resistive touch overlay
• Fits perfectly onto Pi Model A and B

PiTFT - Assembled 480x320 3.5" TFT+Touchscreen for Raspberry Pi - Technical Specifications

• Full-on backlight draws approximately 100mA