---
product_id: 6579705
title: "System Sensor 2W-B i3 Series 2-wire, Photoelectric i3 Smoke Detector"
brand: "system sensor"
price: "€ 86.37"
currency: EUR
in_stock: true
reviews_count: 8
category: "System Sensor"
url: https://www.desertcart.es/products/6579705-system-sensor-2w-b-i3-series-2-wire-photoelectric-i3
store_origin: ES
region: Spain
---

# 12/24 VDC two-wire power source for seamless integration Photoelectric smoke sensor for fast, reliable detection Red LED visual alert for instant status awareness System Sensor 2W-B i3 Series 2-wire, Photoelectric i3 Smoke Detector

**Brand:** system sensor
**Price:** € 86.37
**Availability:** ✅ In Stock

## Summary

> 🚨 Elevate your home safety game with pro-grade smoke detection—because your peace of mind can’t wait!

## Quick Answers

- **What is this?** System Sensor 2W-B i3 Series 2-wire, Photoelectric i3 Smoke Detector by system sensor
- **How much does it cost?** € 86.37 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/6579705-system-sensor-2w-b-i3-series-2-wire-photoelectric-i3)

## Best For

- system sensor enthusiasts

## Why This Product

- Trusted system sensor brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Visual Alert with Red LED:** Stay informed at a glance with a bright, built-in red LED that signals alarm status clearly and instantly.
- • **Seamless Two-Wire Installation:** Simplify upgrades with a 12/24 VDC power source and easy twist-on mounting—DIY-friendly for busy professionals.
- • **Precision Photoelectric Detection:** Advanced sensor technology ensures early smoke recognition, reducing false alarms and enhancing safety.
- • **Built-In Remote Maintenance Signaling:** Proactively monitor detector health remotely, minimizing downtime and maintenance hassle.
- • **Durable US-Made Quality with 3-Year Warranty:** Invest in trusted American craftsmanship backed by a solid 3-year manufacturer warranty for peace of mind.

## Overview

The System Sensor 2W-B i3 Series is a US-manufactured, photoelectric smoke detector designed for reliable early fire detection. Powered by a 12/24 VDC two-wire system, it features a clear red LED visual alert and built-in remote maintenance signaling. With a compact 5.3-inch diameter and 2-inch height, it offers easy DIY installation and is backed by a 3-year warranty, making it a trusted choice for modern home safety upgrades.

## Description

Smoke Alarm, Detection Method Photoelectric, No Interconnection Capability, Power Source 12/24 VDC, Two-Wire, Visual Alert Red LED, Diameter 5-19/64 In., Height 2 In., Digital Readout No, Battery Backup No, Features Removable Detector Cover and Chamber, Built-In Remote Maintenance Signaling, Drift Compensation and Smoothing Algorithms, Hush Button No, Locking Pin No, Operating Temp. 32 Degrees to 120 Degrees F, Standards UL, CSFM, Includes Base, Manufacturers Warranty Length 3 yr.

Review: worked fine for DIY replacement - My house has these installed already by the builder 17 yrs ago. The code says they are good for 10 yrs so I had to bite the bullet and replace them. after calling many local vendors and all of them refused to sell to non-professional client like me, I took a chance and bought from AMZ. The vendor FIRE & SAFETY PLUS returned my inquiry w a mfg date of only 2 months ago do I bought from them despite the price being a little higher. They arrived in about a week and indeed the mfg date was accurate and all 8 detectors worked fine - a blinking green light appeared after installing. Installation was simple since I left the base plate with the wiring in place and simply twisted off each old detector and twisted on the new one. Glad I didn't hire a professional to do this simple task. UPDATE: MAY 2022 We are required to get an inspection from the Fire Dept before selling a house in MA. When the FD arrived and tested some of these detectors, some of them took over a min before the audio signal is activated. Needless to say I did not pass the inspection. After they left, I tested each of the 8 detectors and MOST OF THEM had over a min delay. Only a few activated the audio signal instantly. This is where I really want to praise the vendor I used: Fire and Safety Plus. They were willing to send out 8 new detectors so that I can switch out the defective ones. I received the new badge within 4 days and were able to get 8 working detectors out of all 16. They provided a postage paid sticker so return shipping was free. So I highly recommend this vendor, even if they cost a few bucks more just in case you run into problems like I did.
Review: Great quality - Great quality, just as described, good value, easy to install.

## Features

- Smoke Alarm
- Country of manufacture: United States

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0015Q7RFE |
| Alarm | Visual |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #32,149 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #60 in Smoke Detectors & Fire Alarms |
| Brand | System Sensor |
| Customer Reviews | 4.6 4.6 out of 5 stars (331) |
| Date First Available | March 10, 2008 |
| Included Components | Unit^Instruction Guide |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 8 ounces |
| Item model number | 2W-B |
| Manufacturer | System Sensor |
| Number of Items | 1 |
| Part Number | 2W-B |
| Power Source | Corded Electric |
| Product Dimensions | 2"D x 5.3"W x 5.3"H |
| Sensor Type | Photoelectric |
| Style | Digital |
| Thickness | 1 Inches |
| UPC | 783863017599 |

## Product Details

- **Alarm:** Visual
- **Brand:** System Sensor
- **Item Weight:** 8 ounces
- **Manufacturer:** System Sensor
- **Number of Items:** 1
- **Power Source:** Corded Electric
- **Product Dimensions:** 2"D x 5.3"W x 5.3"H
- **Sensor Type:** Photoelectric
- **Style:** Digital
- **UPC:** 783863017599

## Images

![System Sensor 2W-B i3 Series 2-wire, Photoelectric i3 Smoke Detector - Image 1](https://m.media-amazon.com/images/I/51iwYGDkFfL.jpg)

## Questions & Answers

**Q: Can this unit be mounted on a side wall?  The existing unit in on the side wall so would not be pretty without a sensor covering it.**
A: Yes.  It can be mounted on a wall.  Mount it up high though because smoke rises.

**Q: does this unit fit without any drilling/modifications**
A: 2 mounting screws and a small hole for the wire are needed. The mounting screw holes may align with holes from prior detectors

**Q: Can this model replace a honeywell 5192sd (two wire) addressable detector?  in my current system the smoke detectors connected to a vista 128b panel**
A: No you need a 5193sd.

**Q: I am blocked from shipping this item to a california (although previously i had no problem). why is this unit blocked from shipping to california?**
A: Not sure what store you are trying to buy from but we do ship these to California. Visit Fire and Safety Plus on amazon and you can place your order from there. Email us if you have any problems or questions.

## Customer Reviews

### ⭐⭐⭐⭐⭐ worked fine for DIY replacement
*by M***K on March 17, 2022*

My house has these installed already by the builder 17 yrs ago. The code says they are good for 10 yrs so I had to bite the bullet and replace them. after calling many local vendors and all of them refused to sell to non-professional client like me, I took a chance and bought from AMZ. The vendor FIRE & SAFETY PLUS returned my inquiry w a mfg date of only 2 months ago do I bought from them despite the price being a little higher. They arrived in about a week and indeed the mfg date was accurate and all 8 detectors worked fine - a blinking green light appeared after installing. Installation was simple since I left the base plate with the wiring in place and simply twisted off each old detector and twisted on the new one. Glad I didn't hire a professional to do this simple task. UPDATE: MAY 2022 We are required to get an inspection from the Fire Dept before selling a house in MA. When the FD arrived and tested some of these detectors, some of them took over a min before the audio signal is activated. Needless to say I did not pass the inspection. After they left, I tested each of the 8 detectors and MOST OF THEM had over a min delay. Only a few activated the audio signal instantly. This is where I really want to praise the vendor I used: Fire and Safety Plus. They were willing to send out 8 new detectors so that I can switch out the defective ones. I received the new badge within 4 days and were able to get 8 working detectors out of all 16. They provided a postage paid sticker so return shipping was free. So I highly recommend this vendor, even if they cost a few bucks more just in case you run into problems like I did.

### ⭐⭐⭐⭐⭐ Great quality
*by G***W on October 20, 2025*

Great quality, just as described, good value, easy to install.

### ⭐⭐⭐⭐⭐ Worked right away after installation
*by J***E on September 6, 2024*

I have 2 of these hardwired smoke detectors installed in my house from the builder, one of each floor. I think these are the beginning of the fire alarm loop, the rest of the detectors are wired in with a battery back up. The house is almost 18 years old and the two originals lasted until one went recently and it showed a fault in my alarm system. At first I thought I'd call the alarm company, but then I checked here on Amazon and found the exact match. I unscrewed the bottom part and screwed it into the original base. The base has no working parts, no lights, no chips, it's just a wire connector base, and it was identical. I screwed it in, cleared the fault on my alarm system, and the green light on this detector starting blinking to show it's active. So, thanks to Amazon carrying this, I saved the money of a call out visit from the alarm system monitor. Very happy, nice product, prior to this never had any issues.

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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-01-25*