Check the listing for details. Bosch D604 heat detector head new sealed. Condition: New. Listed at 14.99 USD. This item is a Bosch D604 heat detector head. It is new in sealed package. Manufactuer's Description: Use these detectors for indoor confined areas where a fire increases air temperature slowly and where there is a substantial increase in air temperature before the fire breaks confinement. Furnace rooms, closets, bathrooms, and other confined areas are appropriate applications for fixed temperature detectors. Note These heat detectors are intended for detection circuits that protect property. Use smoke detectors to protect personnel. Use the D604 (response rated at 135°F [57°C]) in areas where the ambient temperatures do not exceed 100°F (38°C) Shipping and handling will be $4 via USPS First Class Mail. No local pickup, international shipping only through the eBay Global Shipping program.