The Nippon Dry-Chemical (NDC) 3308-OKB is a high-reliability analog addressable heat detector designed for integration with compatible fire alarm control panels. It provides early and accurate fire detection by continuously monitoring for both rapid increases in temperature (rate-of-rise) and a fixed high temperature threshold. Its analog communication capabilities allow the control panel to receive precise temperature data, reducing the risk of false alarms and providing detailed device status. The durable, low-profile design makes it suitable for a wide range of commercial and industrial applications where smoke detectors may not be appropriate, such as in kitchens, boiler rooms, or areas with high dust levels.