Simple Weapon
A datadagger is an elaborate and decorative code cylinder (SE 134) that contains a hidden weapon. When the wielder twists the hilt, a needlelike blade extends from the socket. Since the blade is so well hidden within the code’s electronics, it is hard to detect (+5 bonus to the Stealth check to conceal the object and no circumstance bonus if the examiner touches the wielder).

Source: Threats of the Galaxy, p. 13.