EF_ITEM_BLINK is defined as 0x100, or 256.
This effect was added to Source as a supplement to items on Xbox.
This effects makes an entity have a flashing effect, so that it might be noticed easier.
To use this effect, turn off SmartEdit mode and add the following keyvalue pair to the entity:
Remember that you can set the effects value during runtime using an entity's
AddOutput input with the input value
effects x (x being any summation of effects flags to enable).
Warning: Using the AddOutput functionality for this, the new value may interfere with an entity's simulation functionality.