Used consoles must adhere to regional voltage requirements (e.g., 110V vs 220V) to prevent hardware failure; prioritize universal power supply models. Crucially, verify that the consoles are not 'Banned' from online services (PSN/Xbox Live) by checking the Serial Number. For software, confirm the Region Code (NTSC-U, NTSC-J, PAL) matches your target market's needs to ensure game compatibility. Ensure all units have been factory reset to remove previous user data, complying with international data privacy laws.