The SmartKeeper Basic USB-A Port Blocker (Model UL03PKYL) includes 6 yellow USB-A locks and 1 matching yellow key. It naturally blocks inactive USB-A ports to prevent unauthorized insertion of USB drives, cables, phones, and other peripherals, reducing risks of data theft, malware, and data leakage. It is a passive device — requiring no power or software. Installation is easy, tool-free, while removal is possible only with the key. It features a tamper-resistant design with four security holes for a tight fit. The Essential series key is color-matched and can open multiple compatible SmartKeeper Essential products. Ideal for IT managers, offices, schools, kiosks, laboratories, and public facilities.