Why would a power cord be optional?

[michaels]

I bought an hdmi 2 port auto switch and it didn't come with a power cord and it said it was optional. At first I thought it was for the led's that were on it, but the power up when a device is hooked up. Any ideas?

 

[pontifex]

link?

i have a component switch that doesn't use a power cord. there are no lights or anything either though.

 

[michaels]

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi...&viewitem=&item=280109603511&rd=1&rd=1

 

[PottedMeat]

maybe some devices dont supply +5v through the hdmi cable

 

[pontifex]

where do you see the power cord being optional?

 

[michaels]

It was on the instructions and it has a power input that I am not using but it works great. Hold on a sec, I will scan it.

 

[pontifex]

so you have it already? does it work without power cord? if it does, i wouldn't worry