NEC's slot-in options are based on OPS, the "Open pluggable Specification" which is the Intel spec industry-wide digital signage standard. It simplifies device installation usage and maintenance while making it easier to upgrade digital signage equipment. The variety of interchangeable Slot-In option products allows for tailor-made solutions that are perfectly matched to individual demands. OPS standardizes slot size, display connection and power supply specifications. all NEC Large Screen displays (except E Series 32" to 65") plus PX and PH Installation projectors feature this option slot.