Units are tested to power on, load OS, connect to the internet, general input outputs work such as usb, headphone, network connector, etc.. Not all functions are tested. Battery is tested only to the point of does it take a charge and will the unit run without wall power, that is all. Listed functions in descriptions are from manufacturers listing on their website and not a reflection of that function working. This unit in good condition, is unlocked, and runs well. It has some sticker ghosts on the top cover, a bad battery, a defect on the letter A key, and is missing a few screws/brackets and the bottom cover screws. Otherwise it is intact. SSD is brand new, and picked up for this unit.