Power for 5x8 switch?

[cbh]

Right now I have a Terk 5x8 switch hooked up and I currently have it plugged into an electrical outlet using the supplied power adapter. Everything is working fine but I am just curious if this is required and what the power is used for?
Thanks

 

[Mike500]

It is absolutely necessary. It powers the switching electronics. The switch will not work without the power supply.

In a world of competition and bottom line costs in manufacturing, they would eliminate it, if they could. They don't add an additional screw on the case, unless they need it.