The 278B/279B series non-coded fire alarm stations are contemporary styled Lexan stations and are flexibly designed to meet a wide variety of application requirements and operational sequences. The Cat. No. 278B series are double action stations with terminals for field wiring connections. The Cat. No. 279B series are double action stations with six inch (150mm) wire leads for field wiring connections. All types can be either presignal or general alarm and are available with single or double pole alarm contacts which can be normally open, normally closed or a combination or both. Either a key or tool (depending on station selected) is required to reset mechanism. For semi flush mounting use a standard North American four inch square box with a single gang plaster cover having an overlal minimum depth of 2-1/4 inch (57mm). For surface moutning use a Cat. No. K-276B-RSB surface back box.