The Warp Disruption Field Generator I has a number of effects.
Unscripted the module generates a warp disruption bubble with a 16km base range (modified by 25% per level of the HIC skill). It also increases the HICs signature radius, while reducing ship mass, as well as the effects of afterburners and microwarpdrives. It also renders the HIC unable to receive any kind of friendly incoming effects like remote repair etc. The bubble can only be activated in null sec space.
Scripted the module works more like a regular point with increased range and infinite strength. This means the negative effects on mass, signature radius, acceleration and speed are no longer present, but the inability to receive remote assistance remains. The scripted module can be activated anywhere, including low sec and high sec.