What does it mean when christmas lights have 3 way flashing?

I think it means you have the option of the lights all staying on, the lights flashing on and off or the lights “twinkling”.

Edit: Actually, I think the first option would be chasing lights. Chasing, flash on/flash off of the whole string and random twinkling.

It might mean that the lights flash at 3 different wattage/brightness levels.
E.g., the lights might cyclically flash at 30, 60, and then 100 watts.

All good points! But then it also says from left to right? & It doesnt say anything about the lights having a control for those functions like other lights that have those features do?

I thought it meant what @diavolobella said. I don’t know how to explain the left to right thing. Do you have a link for that?

Or you have very kinky Christmas lights.

I thought it had something to do with half price pitchers of beer on Tuesdays down at the neighborhood dive.

does it not mean they can flash 3 different ways:

1 flash on and off,
2 run from left to right in a chasing effect
3 run up and down the icicle

http://www.festive-lights.com/

Have a look on this website it has video clips of how different lights work they may help you

Or they could be the tricolor LEDs since if you put current through them one way they are green. If you put it through the opposite way they are red and if you switch them really fast, haha really really fast, it makes an orange-ish color.

@mrentropy no link it was just an auction I came up on ebay. LOL on the second comment though=)

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rt=nc&nma=true&item=190465873870&si=gviRVwydpvXgtcE7JWVCrd0JCt4%253D&viewitem=&sspagename=STRK%3AMEWNX%3AIT

Thanks for all the suggestions! I ended up bidding & winning the auction. I got a good deal so lets just hope they end up being what I wanted.

Normally Christmas lights come with different flashing sections, the common selection are 1) always on
2) slow 1–2second flashes an
3) faster <1 second flashes.

There is more information here http://www.ukchristmasworld.com/Shop/Indoor-Christmas-Lights.html