Terribly effective once mastered.

This card has 8 inputs and 8 outputs (2 with relays) directly controllable by software. However, this card is not driver by the usual android applications for controlling the GPIO but by another dedicated application, "Raspi-R." It is the only application I found for this card and it works perfectly, after installing the Raspberry supplied libraries. Other libraries (pifacedigitalio) can control the map by the Python programming.