I just got 4 of these devices for automating my electronics around the house. To my surprise, there is no manual included with any of my devices and I can't find a manual online. How do these work? What is the difference between an IR Emitter and an IR Blaster? In the config page, it gives the me the Configuration Options of IR OUT, Sensor In, and Sensor Notify, what are the differences? On port 3, I get the added option of IR Blaster.