The license is for POS device to work on CMS 2. No. of add-on devices supported: 1-6400. Price listed is for single device add-on license. CMS 2: The Central Management System managing unlimited NVR servers, providing Live view and Playback up to 64 channels; Smart Search; Export video; Event management; e-Map; free license for 2-channel ACTi NVR servers included.