The BluCHIP 51E-1R/4I/2O-E5M-EXP is a unified Edge Solution One Reader/Four Input/Two Output System Add-On for One Door. The kit requires PoE or external 12VDC. It includes a Mercury MR51e board with ...The BluCHIP 51E-1R/4I/2O-E5M-EXP is a unified Edge Solution One Reader/Four Input/Two Output System Add-On for One Door. The kit requires PoE or external 12VDC. It includes a Mercury MR51e board with locking two door enclosure with tamper.