When activated, the device protected the wearer with a glowing energy field. Typically, the standard energy shield was only effective against energy attacks, such as blaster bolts. However, other variants created by the Mandalorians and Echani could block melee attacks, while other shields developed by the Arkanians and Verpine, and other cultures, were capable of resisting a variety of different attacks, including electrical, kinetic, cold, heat, and sonic damage.