Security Expert is a gear perk that speeds up disabling alarms and lets you sabotage them. Stopping an outpost from calling reinforcements is a big part of stealth play, so this perk is a solid stealth pick.
You disable alarms faster, and you get the option to sabotage them. That stops guards raising the alarm when they spot you.
Wear the Caveira Gauntlets, Tea Timepiece or Techmaster Band. Gear perks are fixed to the piece of clothing that carries them, so you get this one by wearing that piece, not by unlocking it in a menu.
Surveillance Sense tags nearby surveillance devices for you. The Volta Supremo can also knock out alarm boxes with its EMP.