The Pip-Boy, a personal computing device strapped to the player character's wrist, allows the player to access a menu with statistics, maps, data, and items the player has acquired. The player can find game cartridges, which can be played on the Pip-Boy or a terminal. A new feature for the Pip-Boy interface is a downloadable application for iOS, Android, and Windows smartphones and tablets. This optional app allows players to access the Pip-Boy interface on a separate screen, and play the collected game cartridges when not playing the main game. Another returning gameplay feature is the Vault-Tec Assisted Targeting System (V. A. T. S. ). While using V. A. T. S. , real-time combat is slowed down (instead of stopped entirely as in previous entries), and action is played out from varying camera angles in a computer graphics version of "bullet time". Various actions cost points, limiting the actions of each combatant during a period of time, and the player can target specific body parts for attacks to inflict specific injuries; headshots can be used for quick kills or to blind, legs can be targeted to slow enemy movement, and opponents can be disarmed by shooting at their weapons. Unlike previous games, in which the player had a random chance to inflict a critical hit, they are now performed manually through V. A. T. S.