The Edwards EST PT-1S+ offers several upgrades over its predecessor, the PT-1S. Firstly, it boasts enhanced sensitivity and reliability in detecting smoke, ensuring quicker response times to potential fire hazards. Additionally, the PT-1S+ features improved communication capabilities, facilitating seamless integration with modern fire alarm systems. Lastly, its streamlined design and enhanced durability make it a robust choice for both new installations and retrofitting projects. Overall, the PT-1S+ represents a significant advancement in smoke detection technology, providing enhanced safety and peace of mind for building occupants.