YC-400
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4 Gang Size Back Box
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The 4 gang size back box shall make it possible to recess an N-SP80 series door station, manufactured by TOA Corporation, into a brick or stud wall. 
The metal back box shall have several knock out holes in the sides and rear to gain easy access to cables.
The dimension shall be 98.2 (W) x 187 (H) x 58.1 (D) mm (3.87" x 7.36" x 2.29") weighing 440 g (0.97 lb).

Manufacturer: TOA Corporation
Model: YC-400