You can personalize armor by purchasing and installing armor upgrades. Armor upgrades are installed into the upgrade slots of armor; one armor upgrade occupies one armor upgrade slot. The number of upgrade slots a specific suit of armor has is noted under that armor's description. You can install an armor upgrade with the
Install Upgrade activity, which takes 10 minutes to perform. Unlike many other types of equipment, armor upgrades run on kinetic energy created by your body's motion, and they don't need external batteries. They function only when installed in armor you're wearing properly.
Some armor upgrades that have special activations and benefits can be activated only a limited number of times per day, as described in the armor upgrade. This limit is independent of any costs for activating the upgrade. This limit resets during your daily preparations. The limit is inherent to the armor upgrade, so if an ability that can be used only once per day is used, it doesn't refresh if the armor upgrade is uninstalled and reinstalled or is installed in another suit of armor, or if another creature tries to activate the upgrade. Similarly, armor has innate safety overrides that prevent you from installing a duplicate of an armor upgrade you've already used the limited action of and from trying to use that action again.