# SITERWELL GS509A Battery-Powered Photoelectric Smoke Detector, 4-Pack

Battery-Powered Pack: SITERWELL GS509A smoke detectors use a photoelectric sensor and a replaceable 9V battery, with audible alarm and low-battery warning features. The listing also describes hush and fault-code warnings, and claims UL 217 10th Edition certification.

- [Original product page](https://best-deals.pro/product/siterwell-gs509a-photoelectric-smoke-detector-4-pack)
- [View offer](https://best-deals.pro/visit/siterwell-gs509a-photoelectric-smoke-detector-4-pack)
- Market: US
- Language: en-US
- Currency: USD
- Brand: SITERWELL
- Model: GS509A-EAN
- Category: Electronics > Smart Home & Security > Alarms & Sensors
- Price: 54.50 USD
- Previous price: 72.63 USD
- Discount: 25%
- Price checked: 2026-11-13T05:44:37.698Z
- Rating: 4.9 / 5
- Reviews: 30

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Photoelectric sensing is described as suited to detecting slow-smoldering fires.
- The listing claims UL217 10th Edition certification.
- Low-battery reminder, hush function and fault-code warning are listed.
- The listing describes a magnetic mount for wall or ceiling installation.

## Pros

- Replaceable 9V battery avoids a hardwired power connection.
- Hush and fault-code warning features are listed alongside the low-battery reminder.
- The claimed magnetic mounting can simplify placement where compatible with the intended installation.

## Specifications

### Identity
- Brand: SITERWELL
- Model: GS509A-EAN
### Power and battery
- Power configuration: Battery Powered
- Battery type: 9V battery
- Claimed battery replacement cycle: 1-year replacement cycle
### Detection and alerts
- Sensor type: photoelectric
- Alarm: Audible
- Alarm sound level claim: >85dB\(A\) loud alarm at 3 meters
### Dimensions and installation
- Dimensions listed: 3.93"D x 3.93"W x 1.37"H
- Installation claim: This battery-operated alarm mounts easily on any wall or ceiling.
### Materials and protection
- Material listed: ABS
- Color: White
- Operating humidity: 10~95% RH non-condensing
- Upper temperature rating: 100 °F
### Product life and coverage
- Claimed product lifespan: 10-year long-term reliability
- Manufacturer warranty description: 2 Year

## Before you buy

- The listing says the detector is engineered for a 10-year product lifespan but also gives a 1-year battery replacement cycle. Confirm replacement and maintenance guidance for your intended installation. The title specifies four packs, while the details field says one item, and the supplied box list names one smoke alarm with a battery and installation accessories. Confirm the selected package quantity and contents. The UL217 10th Edition statement and magnetic mounting claim are manufacturer claims, not independently verified here.

## A good fit for

- Buyers seeking battery-powered photoelectric smoke alarms with replaceable 9V batteries.
- Homes, apartments or rentals where a battery-operated wall or ceiling alarm is suitable.
- Buyers who want listed hush, low-battery and fault-code warning features.

## Less suited to

- Buyers requiring hardwired or interconnected alarms.
- Buyers seeking a carbon monoxide detector or a combined smoke and CO alarm.

## Customer feedback

The aggregate ratings are strongly positive, with most ratings in the five-star category and the remainder in the four-star category. The sample is limited and provides no specific comments, so it cannot establish how users experienced the sensor, alarm, battery life or installation. Consider the stated replaceable-battery arrangement and verify package quantity and maintenance details for your needs.

## Frequently asked questions

### What type of battery does this smoke detector use?
The listing describes a replaceable 9V battery and claims a 1-year replacement cycle. Follow the product instructions for battery and maintenance guidance.
### Does it have a hush function?
Yes. The feature listing mentions a hush function for false alarms.
### Is the detector hardwired?
The listed power configuration is battery powered, not hardwired.
### How many detectors are included?
The title says four packs, but the details and supplied package information are inconsistent. Confirm the selected listing's quantity before buying.

## Alternative options

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- [Heiman Smoke Detector, Battery Powered Photoelectric Smoke Alarms for Home \| 3 Pack Mini Compact Fire Alarms for Indoor Apartment Rental, Fewer False Alerts, UL 217-10th, 10 Year Battery Operated, S1-S](https://best-deals.pro/visit/siterwell-gs509a-photoelectric-smoke-detector-4-pack)
- [SITERWELL Smoke Detector Fire Alarms 9V Battery Operated \| Photoelectric Smoke Alarm with Silence Button & Low Battery Warning, Easy Install Fire Detectors,2 Packs](https://best-deals.pro/visit/siterwell-gs509a-photoelectric-smoke-detector-4-pack)
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- [SITERWELL Smoke Detector 10 Year Battery Smoke Alarm \| Photoelectric Fire Alarms with Low Battery & Fault Warning for House and Bedroom, UL217 Listed, GS525A, 3 Packs](https://best-deals.pro/visit/siterwell-gs509a-photoelectric-smoke-detector-4-pack)
- [SITERWELL Smoke Detector Carbon Monoxide Detectors Combo 10 Year Battery \| Hardwired Smoke and Co Alarms, Interconnected Co Detectors with Bilingual Voice Alerts For Home,1 Pack](https://best-deals.pro/visit/siterwell-gs509a-photoelectric-smoke-detector-4-pack)
- [Heiman Smoke Detector, Photoelectric Battery Powered Smoke Alarm for Home \| 10 Year Product Life, Tiny Compact Fire Alarm, UL 217, Test Silence Button, for Indoor Apartment Rental, S1-S](https://best-deals.pro/visit/siterwell-gs509a-photoelectric-smoke-detector-4-pack)
- [SITERWELL Smoke Detector Photoelectric Smoke Alarm 9V Battery \| Hardwired Smoke Detectors Interconnected, Fire Alarm with Test/Silence Button, UL217 Listed Fire Detector,GS562A, 8 Packs](https://best-deals.pro/visit/siterwell-gs509a-photoelectric-smoke-detector-4-pack)

## Add-ons

- [Amazon Basics 8-Pack 9V Long-Lasting Alkaline Batteries for Smoke Detector, Electronics & Audio, Reliable, 5-Year Shelf Life](https://best-deals.pro/visit/siterwell-gs509a-photoelectric-smoke-detector-4-pack)

## Images

![SITERWELL GS509A Battery-Powered Photoelectric Smoke Detector, 4-Pack — 1](https://best-deals.pro/i/6JESzNb8C2OPh7X6G6-79ChWKh9a7h-A46lj6LgfnXSUQYxZi_RxchLh7hz5vuGU0drD_ZuB2mpaRg2O2fgRJFHrhxBZ0zP3Wr1zB-Wh_8ufRUjT17MlmEpN.jpg)

![SITERWELL GS509A Battery-Powered Photoelectric Smoke Detector, 4-Pack — 2](https://best-deals.pro/i/eTu3A7oMYKalaM9rpva5Nr2PPN5GHZUzDohj5U8Pq6FmOGFoX5bIHa5-aPZhFi1jWY7dPGABIWu8h655JWePELpg7zaayFfw-SJh6beHAZKRutfnKuxPcIpr.jpg)

![SITERWELL GS509A Battery-Powered Photoelectric Smoke Detector, 4-Pack — 3](https://best-deals.pro/i/k0vrTAlzpYzf8Rz9IrbBsa1vfbwPzBxEs8WEuZL1OoK1q_M5gIJso04Fh5g9-UOCEdLCj6brqdKGnNeQucAxXeTicC7TA6-tggx0BR7Hhus_oLXABWd3uIEO.jpg)

![SITERWELL GS509A Battery-Powered Photoelectric Smoke Detector, 4-Pack — 4](https://best-deals.pro/i/yfyQcwLj-pLcRq_eUHPzAZ_G35PPjzZPSJmMiK5D0KEwTgTL_xj7fH277TG_COcmVmVUv28h6ArRm6AQQBmSRcZ6_omEbujE0vGfn_gFRRFAANVgS1cCeuiJ.jpg)

![SITERWELL GS509A Battery-Powered Photoelectric Smoke Detector, 4-Pack — 5](https://best-deals.pro/i/VfRugfoN17k4Yrebk2dgWx-Ih7UNlkRJabn86W87b2A2ppSUF9ut1Go0I7cKUhvq51JYz8LaxYF1pErzsOB4OFHpSWuRVGBgwPOqtnDqBfpBK-hfKF1c0Dxp.jpg)

![SITERWELL GS509A Battery-Powered Photoelectric Smoke Detector, 4-Pack — 6](https://best-deals.pro/i/Rqxnme3yR9N_jeTgW_wXck0ZoJ-F2dpICm76Rjmqv1A1rn4TNZ46kajpmKI1Sc7cNA6Mxby_8AJ0ysKrG6CCru0csdkaQ9Qng1f9dVtq-r2dYdlLwgjVaMAo.jpg)

![SITERWELL GS509A Battery-Powered Photoelectric Smoke Detector, 4-Pack — 7](https://best-deals.pro/i/Bb4bjYzQQziKY298hyw25JSHJcFGzxgNFRFl323IqEeYUqNsdQe6GsPzgTIA_8Jou4rarLCl2M_42qfOPBig8YFoZlT2Da0c0mNCSX8siWO2iF8-xmAeDFKA.jpg)