1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your ELRO FS1805 Smoke Alarm Kit. The ELRO FS1805 smoke alarm is designed to detect smoke and alert occupants to potential fire hazards, complying with European standard EN14604. It features a 5-year battery and a convenient magnetic mounting system for easy installation.

Image 1.1: ELRO FS1805 Smoke Alarm Kit with magnetic mounting and 5-year battery indication.
2. Package Contents
Verify that all items are present in your package:
- 2 x ELRO FS1805M Smoke Detectors
- 2 x Magnetic Mounting Sets
- 2 x Batteries (with a lifespan of 5 years)
- 1 x Instruction Manual

Image 2.1: Contents of the ELRO FS1805 Smoke Alarm Kit packaging.
3. Setup and Installation
The ELRO FS1805 smoke detectors are designed for easy installation using the included magnetic mounting kit. No drilling or screwing is required.
3.1. Battery Activation
- Before installation, ensure the battery is correctly activated. The detector comes with a pre-installed 5-year battery.
- Follow the instructions on the detector to activate the battery, typically by rotating the detector onto its base or removing a pull tab.

Image 3.1: Activating the 5-year battery during installation.
3.2. Magnetic Mounting
- The magnetic mounting set consists of two strong magnetic discs with high-quality self-adhesive strips.
- Peel the protective film from one magnetic disc and firmly attach it to the back of the smoke detector.
- Peel the protective film from the second magnetic disc and firmly attach it to your ceiling at the desired location.
- Align the smoke detector with the magnetic disc on the ceiling and click it into place. The magnets will hold the detector securely.

Image 3.2: Magnetic mounting installation steps.
3.3. Placement Recommendations
For optimal operation, place at least one smoke alarm on each floor of your home. Always mount the smoke detector against the ceiling. Recommended locations include:
- Hallways
- Landings
- Stairwells
- Bedrooms
- Living rooms
Avoid placing smoke alarms in kitchens, bathrooms, or garages where steam, cooking fumes, or exhaust can cause false alarms.

Image 3.3: Recommended placement areas for smoke alarms.
4. Operating Instructions
The ELRO FS1805 smoke alarm features an optical sensor that quickly reacts to smoke. In the event of a fire, the detector will emit an alarm of at least 85dB.
4.1. Test Button
The smoke alarm is equipped with a test button to verify its functionality. Press and hold the test button for a few seconds. The alarm should sound, indicating that the unit is working correctly. Release the button to stop the alarm.
4.2. Low Battery Indicator
The detector includes a low battery indicator. When the battery is nearing the end of its 5-year lifespan, the unit will emit a short chirp or flash an LED periodically to alert you that the battery needs replacement. Since the battery is integrated for 5 years, the entire unit should be replaced when the low battery indicator activates.

Image 4.1: Internal components showing the test button and optical sensor.
5. Maintenance
Regular maintenance ensures the optimal operation of your smoke detector.
- Monthly Testing: Test the smoke detector functions every month by pressing the test button.
- Cleaning: For optimal operation, keep the smoke detector clean. Gently remove dust and debris from the detector every month using a vacuum cleaner with a soft brush attachment. Never use cleaning agents or liquids to clean the detector.
- Battery Replacement: The integrated battery has a lifespan of 5 years. When the low battery indicator activates, the entire smoke alarm unit should be replaced.
6. Troubleshooting
If your smoke alarm is not functioning as expected, consider the following:
- No Alarm During Test: Ensure the battery is properly activated. If the battery is old, the unit may need replacement.
- False Alarms: False alarms can be caused by steam, cooking fumes, or dust. Relocate the detector if it is consistently triggering false alarms in areas with these conditions. Clean the detector as described in the maintenance section.
- Chirping Sound: A periodic chirping sound indicates a low battery. The unit needs to be replaced.
If issues persist after following these steps, contact customer support.
7. Specifications
| Feature | Specification |
|---|---|
| Brand | ELRO |
| Model Number | FS180521 |
| Style | Smoke Detector |
| Power Source | Battery Powered (5-year lifespan) |
| Sensor Type | Optical |
| Alarm Volume | 85 dB |
| Product Dimensions | 9D x 9W x 3H Centimeters |
| Diameter | 89.5 mm |
| Height | 35 mm |
| Item Weight | 204 Grams |
| Material | Plastic |
| Compliance | European Standard EN14604 |

Image 7.1: Dimensions of the ELRO FS1805 Smoke Alarm.
8. Warranty and Support
ELRO offers a 5-year warranty on this smoke detector, ensuring reliable quality and peace of mind. For technical assistance or warranty claims, please refer to the contact information provided with your product or visit the official ELRO website.

Image 8.1: Manual and Customer Service icons.





