If they are hooked up to the same wires as the blinker, they should blink when the blinkers do.
Mine are actually just hooked directly, so even when my car is off, the halo's stay on.... pretty sweet effect, and if won't drain the battery.... If you do that, be prepared to have alot of people telling you that you left your lights on lol.
Have fun with the setup.
-Shawn.