Check the listing for details. NEW Simplex FIRE ALARM fixed temperature 135 deg F 4255-7. Condition: New – Open box. Listed at 24.99 USD. These are new old stock items as pictured. One circuit normally open 135 degree F temperature. White colorFree shipping is LOWER 48 states onlyFor reference only manufactures details below, please make sure these work for you. Please note only the fixed temperature details apply to this unit. Features  Automatic detection of fires Compact, rugged construction  Rate-of-rise and fixed temperature principles of operation  Large area of protection per unit Contact ratings:  3 A @ 6-125 VAC  1 A @ 6-28 VDC  0.3 A @ 125 VDC Description 4255 series heat detectors are an ultra-sensitive electric thermostat designed to automatically detect the excessive heat created by a fire. The compact, simple designed units are rugged and unaffected by vibration. All metal parts are brass, or aluminum and are mounted on a durable, mineral-filled, phenolic base. No exposed metal parts carry current. Electrical contacts are all silver clad and of ample size. Large line terminals and wire ways are provided in the base for easy and efficient installation in either open wiring or concealed wiring systems. Two versions are available: Rate-of Rise and Fixed Temperature, and Fixed Temperature only. The rate-of-rise method detects fires that grow rapidly in intensity by quickly responding to abnormally fast temperature increases. The fixed temperature method detects smoldering fires, which build temperatures to a high level at a slow rate, by responding to a specific temperature setting. Fixed Temperature Only: The fixed temperature only version is of the same size and style of construction as the rate-of-rise and fixed temperature version, but without the rate-of-rise element. We always leave five star feedback at the conclusion of every transaction, which includes you leaving us 5-star feedback.Free shipping is LOWER 48 states onlyThank you for looking!LOCATION RACK22-BOX2