Check the listing for details. M500MB MONITOR MODULE SIGNALLING DEVICE by SYSTEM SENSOR Issue AR-7528. Condition: New – Open box. Listed at 34.99 USD. This smoke detector monitoring module by System Sensor is a reliable signaling device perfect for fire protection equipment in various industrial facilities. Its model, M500MB, is made in the United States and comes with a manufacturer specification warning in compliance with California Prop 65. The unit type is a single piece and is ideal for any business that requires fire alarms. The brand System Sensor is known for producing high-quality smoke detectors, and this module is no exception. It is easy to install, and the unit quantity is one. Its essential aspects include type, model, and country/region of manufacture. This module falls under the category of facility maintenance and safety, making it an excellent choice for businesses and industries that prioritize safety. H29