The Arlington FLBR5420BL is an indoor floor box designed to recess your power and data connections below the existing floors' surface, this eliminates the plugs sticking up above the floor. Now you don't have to worry about tripping hazards, and it keeps a cleaner look on your floor. There are two keystone openings to add in your low voltage connections such as RJ45, RJ11, or HDMI. There are blanks included for any unused openings. The black powder coated slotted cover allows the cable to pass through the cover with the lid on the box. The cover isn't secured to the box so it allows the cables to exit the box in any direction required. There is also an included blank cover that can be used when nothing is plugged in. The top is thin and sits ultra close to the floor. Included in the kit is the 24.5 cubic inch back box, 20 Amp tamper resistant power outlet, black slotted cover, black blank cover, two keystone blanks, and installation screws. The kit does not include the data jacks, those are sold separately.