I thought about adding another one but I wonder if 2 flashers not synchronized close together is somehow confusing to a driver or not.
As a side note I found that Adventure Lights makes a bicycle attachment for these and I bought several from this place
http://www.essentialgear.com/store/p...ttachment.html
I ordered and within hours got a "Shipped" email. They have Guardian lights as well albeit they're a little expensive. You can get them on ebay for less.
Don't know if anybody knocks these off or not though. Sold through a brand called eGuardian but made by Adventure Lights.
John