1. Model 1A/1A+ - Using a Y-cable to provide more power to the display

A Y-cable helps deliver more power to the display when the computer USB port (such as a laptop) cannot provide the necessary power. 

 

 Model 2A has an extra power port on the outside of the enclosure therefore a Y cable is not needed. 

 Model 1A+  has an extra power port inside the enclosure on the LCD board which can be used as an alternative to the Y-cable.