Master Key Twin Head. Protect your devices. Lenovo offers the latest standard in device security– the MicroSaver 2.0 Twin Head Cable Lock from Lenovo. It locks 2 devices with the same cable lock. Engineered to be the smallest, strongest lock for desktop, laptop, monitor and other devices, the MicroSaver 2.0 represents the next generation of laptop security. The MicroSaver 2.0 was developed using strict specifications, patented technologies, and rigorous testing against tough environmental conditions, and can stand the test of time in a smaller, compact size without compromise.