2N Access Unit M - Flush Mount Box. Compatible with 2N Access Unit M. Color: Black. Installation accessory that provides space for wiring within the wall. Typically, the installer will use this box when installing the 2N Access Unit M reader in a brick wall, as it allows for easy cutting of a hole for the box. Simply secure with 2N. 2N is a leading European company in the development and manufacturing of information and communication technology and security products. It is a global market leader in the field of IP intercom systems. All products comply with strict international standards and are compatible with third-party systems. The 2N product lines include, among others, IP intercoms for door communication and emergency calls, as well as IP audio systems designed to make life easier and safer. In 2016, 2N was acquired by the Axis Group.