iDisplayMate is utility app that allows your iPad and iPhone to be used as second monitor for your Mac either via USB or WiFi!

With iDisplayMate you can work more effectively. Using iPhone/iPad as extra display can increase productivity for engineers, designers, and artists!

Features:
-Support both USB and WiFi mode
-Secure and fast connection
-Easy setup Plug and Play
-Touch control (Tap, Scroll, Drag, Zoom)
-Retina display support
-Seamless switch between USB& WiFi mode

Setup steps:
-Download iDisplayMateServer for your Mac.
-Run iDisplayMate from iPhone or iPad
-Connect your iPhone/iPad to Mac

When you Unplug USB it will automatically switch to WiFi Mode. To use WiFi mode make sure iPhone/iPad and Mac are connected to the same WiFi network.

iDisplayMateServer for Mac download link:
http://www.mobilesoft.kr/idisplaymate.html