• The OPTEX OA-PRESENCE TN is designed to create optimum safety around sliding doors. When using the OA-PRESENCE TN for threshold safety the use of safety beams is no longer mandatory. The OA-PRESENCE TN enables you to install maximum safety in compliance with the latest European and local regulations, including EN 16005 and DIN 18650. The OA-PRESENCE TN has been tested and approved by the German test organization TUV.