Pip - Boy 3000 Mark IV The Pip - Boy 3000 Mark IV is a pre - War Personal Information Processor ( PIP ) in " Fallout 4 " manufactured by RobCo Industries and acts as a database for the wearer ' s personal information and inventory . It is an updated version of the Pip - Boy 3000 . Background . The Pip - Boy 3000 Mark IV was distributed to all 6 Vault - Tec vault s in the vicinity of Boston : Vault 75 , Vault 81 , Vault 95 , Vault 111 , Vault 88 and Vault 114 . Functions . The Pip - Boy 3000 Mark IV is a multi - functional device that features a built in Geiger counter and has been programmed to display the wearer ' s stats , area maps , inventory , and item properties . Its screen also acts as a flashlight in low visibility areas and it has a dial for tuning into radio frequencies . It is a more ergonomically designed and up - to - date version of the Pip - Boy 3000 used in other vaults and according to its start - up screen , the system consists of : Statistics menu . The statistics menu , or ' Stats ' , shows the user ' s damage and resistance , health , AP , experience and limb condition . The levels of their SPECIAL attributes are shown in a separate tab , with a third tab displaying various perks they have acquired . Inventory menu . The inventory menu is a system used for viewing and managing collected items . The menu also displays total caps and carry weight at the bottom of the screen . It is sorted into seven tabs : It should be noted that this Pip - Boy , while being an upgraded version of the Pip - Boy 3000 , does not have the same keychain functionality and is susceptible to key clutter in the miscellaneous tab . Data menu . The data menu is mainly used as a means to keep track of overall progression , as well as view the current date and time in - game . It is divided into three categories : Map menu . The map menu opens centered on the device ' s current location . It can switch between world and local maps and can be used to view current supply lines between settlements . The user can view all discovered and marked locations , set waypoints and find the location of a current quest objective . Radio menu . No longer in the data menu , radio stations now have their own tab . Diamond City Radio and the Classical Radio will always be shown by default , with new radio frequencies appearing as they are found . If outside the broadcast range of a frequency , it will be grayed out and will not be selectable . Pip - Boy light . The Pip - Boy display can be set to an over - bright mode to provide illumination in dark areas . The color of this light matches the user ' s selected display color preference , which is changed in the actual game display options . To activate the Pip - Boy light , hold down the button used to access the Pip - Boy . Adapter plug . A unique feature of the Pip - Boy 3000 Mark IV is an adapter plug attached to the underside of the device . This plug is used to perform diagnostics on power armor , as well as open and close the main doors of vaults in the Commonwealth , effectively making the Pip - Boy a vault key . In addition , the plug is also used to gain control of robots if the Robotics Expert perk is active .