Gira E2, Gira E22 device box for flat installation 1-way Features: Using the Gira device box and cover frame for flat installation, the Gira E2, Gira E22 switch range can be installed flat on the wall. For flush-mounted installation in masonry, the device box is inserted into a flush-mounted installation box and this is embedded in the wall. Notes: The device box does not have a cable retention.