This is unassembled version, SOLDERING REQUIRED, so you can make flexible use.
The kit included:
I/O extension PCB, 1 pcs.
Male header, 120 pins.
Female Header Socket, 1x 10pin, 5x 8pin, 1x 36pin(dual row).
Ø5mm green LED, 1 pcs.
300 ohm 1/4W resistor, 1 pcs.
47uF/35V SMD electrolytic capacitor.
6x6x5mm tactile switch, 1 pcs.

PCB Dimension: 101.6mm x 53.34mm / 4" x 2.1"
PCB thickness 1.6mm, high quality FR-4 glass fiber PCB.
Male header pitch 0.1"/2.54mm, pin height (from PCB to top) 8.5mm / 0.34"
Female Header Socket pitch 0.1"/2.54mm, pin length 15mm / 0.59"
Note: the item not include Arduino MEGA 2560 module.