This set includes 10 ADT Thorn 801PH MX Optical Smoke and Heat Detectors, model number 516.800.500. These detectors are designed to provide reliable and accurate fire protection for your facility. The brand of the detectors is ADT, a trusted name in the fire protection industry. The detectors are suitable for use in various settings, including business, office, and industrial facilities. They are easy to instal and use, and provide a reliable early warning system for fire outbreaks. Whether you are looking to protect your property or comply with fire safety regulations, this set of detectors is an excellent choice.