A. Features: 1. [Wide Application] It is suitable for smoke detection in indoor environments such as residences, shopping malls, hotels, restaurants, and office buildings. 2. [Wired Networking] The smoke alarm uses a wired networking method and can be linked with building intercom systems, security alarm systems, etc. 3. [High Sensitivity] Using precise production processes, the smoke alarm has relatively high sensitivity and good performance. 4. [Low Power Consumption] Made of certain materials, the smoke alarm is stable, reliable, durable, and has relatively low power consumption. 5. [Audible and Visual Alarm] Equipped with a red LED alarm indicator, it has an audible and visual alarm function, with relatively simple operation and convenient use. B. Specification Parameters: 1. Product Type: Smoke Alarm 2. Material: ABS 3. Model: 820 4. Purpose: It is suitable for smoke detection in indoor environments such as residences, shopping malls, hotels, restaurants, office buildings, teaching buildings, banks, libraries, computer rooms, and warehouses. 5. Operating Voltage: DC 9V to 28V 6. Static Current: 70mA 7. Alarm Current: 90mA 8. Alarm Indicator: Red LED 9. Alarm Sound Pressure: 85dB/m 10. Operating Temperature: -10°C to +50°C 11. Environmental Humidity: 95%RH (non - condensing) 12. Monitoring Area: 40 square meters 13. Alarm Mode: Audible and Visual Alarm C. Package List: 1. Smoke Sensing Device ×1 2. Terminal Wire ×1 3. Screws ×2 4. Expansion Tubes ×2 5. User Manual ×1