From the publisher's website:
Signature Abilities reward the most dedicated characters in the Star Wars™ Roleplaying Game. Display your talents and immerse yourself in adventure with Star Wars: Force and Destiny Specialization Decks! Available through FFG’s in-house manufacturing, the Sentinel Signature Abilities deck includes all the cards you need to keep track of your Signature Abilities and their upgrades. With these cards in hand, you can spend less time researching your options and more time experiencing the thrills of life in the Star Wars universe.
In battle, Unmatched Vigilance gives a Sentinel ultimate control over the ebb and flow of the struggle, should battle be necessary. In the shadows, My City allows the character to possess or obtain required information about an urban setting in an instant.
The Sentinel Signature Abilities Deck contains:
2 cover cards (including a reference guide for each deck)
18 standard sized talent cards