frient Zigbee Smoke Alarm SMSZB-120

Detect Smoke Locally and Receive Smart Alerts Through Zigbee

What is the frient Zigbee Smoke Alarm?

The frient Intelligent Smoke Alarm SMSZB-120 is a battery-powered Zigbee 3.0 smoke detector with an optical smoke sensor, built-in 85 dB siren and integrated temperature monitoring. It sounds locally when smoke is detected and can also report smoke events, battery status and temperature to a compatible Zigbee gateway.

The alarm is designed for indoor residential use and is certified to DIN EN 14604. Its compact 65 mm diameter housing contains a replaceable CR123 battery rated for approximately three years of operation, while Zigbee connectivity allows compatible smart-home platforms to send remote notifications when an alarm is triggered.

Key Takeaways

• Zigbee 3.0 smart smoke detector
• Optical smoke sensing
• 85 dB siren measured at 3 meters
• Built-in temperature sensor
• Temperature range from 0°C to 50°C
• Replaceable CR123 battery
• Approximately 3-year battery life
• Low-battery reporting
• Compact 65 × 40 mm design
• IP20 rated for indoor use
• DIN EN 14604 certified
• Compatible Zigbee gateway required for smartphone notifications
• Zigbee2MQTT support for SMSZB-120
• Can expose smoke, temperature and battery data to supported smart-home systems

More Than a Traditional Smoke Alarm

A conventional smoke alarm can warn you when you are at home, but that alarm may go unheard if you are at work, traveling or away from the property.

The frient Zigbee Smoke Alarm adds smart-home connectivity to the traditional local siren.

If smoke is detected, the unit sounds its integrated alarm locally. When connected to a compatible Zigbee gateway, the event can also be passed to your smart-home system so that you can receive a remote notification.

This makes the SMSZB-120 particularly useful for:

• Primary homes
• Apartments
• Holiday homes
• Second homes
• Rental properties
• Home Assistant installations
• Zigbee smart homes

The local siren does not depend on a smartphone notification to warn occupants. Zigbee connectivity adds remote monitoring on top of the alarm's local smoke-detection function.

Why Choose the frient Zigbee Smoke Alarm?

Optical Smoke Detection

The SMSZB-120 uses an optical smoke sensor to detect smoke particles in the surrounding air.

When smoke reaches the detector's alarm threshold, the unit activates its local siren.

Optical detection is the smoke-sensing technology specified by both frient and the retailer listing for this model.

85 dB Local Siren

The alarm includes an integrated siren rated at 85 dB at 3 meters.

This provides an immediate local warning when smoke is detected, even if your phone, gateway or internet connection is unavailable.

Smart notifications should therefore be treated as an additional convenience rather than a replacement for the alarm's local audible warning.

Remote Smoke Notifications

When connected to a compatible Zigbee gateway or smart-home system, the alarm can report a smoke event remotely.

This can help you become aware of an incident when you are away from home and take appropriate action.

The linked retailer specifically notes that a Zigbee gateway is required for smartphone notifications.

Zigbee 3.0 Connectivity

The frient SMSZB-120 communicates using Zigbee 3.0 and operates as a Zigbee end device.

Because it is battery powered, it does not act as a Zigbee mesh router.

A compatible powered Zigbee router or coordinator should therefore be available within reliable range of the detector.

Built-In Temperature Monitoring

The SMSZB-120 includes a temperature sensor in addition to smoke detection.

frient specifies:

• Measurement range: 0°C to 50°C
• Resolution: 0.1°C
• Accuracy: ±0.5°C

When your Zigbee platform exposes the temperature entity, this extra measurement can be used for:

• Room monitoring
• Home Assistant dashboards
• Temperature alerts
• Heating automations
• General environmental monitoring

The temperature sensor is an additional smart-home feature and should not be treated as a substitute for a dedicated heat alarm where one is required by local regulations.

Replaceable CR123 Battery

The smoke alarm runs on one replaceable CR123 battery.

frient specifies an expected battery life of approximately three years, based on reporting every five minutes. Battery level and low-battery status can also be reported through compatible Zigbee systems.

Actual battery life can vary according to:

• Zigbee signal quality
• Reporting activity
• Number of alarm events
• Operating temperature
• Battery quality

A weak Zigbee connection may also cause a battery-powered device to consume additional energy while attempting to communicate with the network.

Compact Indoor Design

The SMSZB-120 measures just:

Ø65 × 40 mm

and weighs approximately 126 g according to the linked retailer.

Its compact dimensions make it less visually intrusive than many traditional smoke alarms.

The housing is rated IP20, which means it is intended for dry indoor environments rather than outdoor or wet-area installation.

Certified Smoke Alarm

The frient Intelligent Smoke Alarm conforms to the manufacturer's listed CE, RoHS and REACH requirements and is certified to DIN EN 14604.

The linked Reichelt listing additionally states compliance with DIN 14676.

Installation and placement should still follow the applicable smoke-alarm requirements and building regulations in the country where the alarm is installed.

Home Assistant and Zigbee2MQTT

The SMSZB-120 is documented by Zigbee2MQTT.

Zigbee2MQTT currently lists the SMSZB-120 under Develco, with frient versions recognized as white-label variants of the same hardware family. Supported exposed values include:

• Smoke
• Battery low
• Test state
• Temperature
• Battery percentage
• Battery voltage
• Fault state
• Reliability state
• Alarm control
• Maximum siren duration

This makes the detector particularly useful for Home Assistant users who want smoke and battery status visible alongside the rest of their Zigbee devices.

Home Assistant Automation Ideas

Smoke Alert Notification

Send a high-priority notification to your phone whenever the smoke entity changes to detected.

Turn On Lights During an Alarm

When smoke is detected, turn on selected smart lights to improve visibility along exit routes.

Battery Warning

Create an alert when the smoke detector reports a low battery condition.

Temperature Monitoring

Add the built-in temperature measurement to your room dashboard or use it as an additional environmental data point.

Multiple Alarm Notifications

If several Zigbee smoke alarms are installed, create a dashboard showing the status of each room individually.

Do not rely on Home Assistant automations as the sole means of fire warning. The local certified smoke-alarm function remains the primary life-safety warning mechanism.

Technical Specifications

Specification	Details
Product Name	frient Intelligent Smoke Alarm
Model	SMSZB-120
Product Type	Smart Smoke Detector
Wireless Protocol	Zigbee 3.0
Zigbee Device Type	End Device
Smoke Sensor	Optical
Siren Output	85 dB at 3 m
Temperature Sensor	Yes
Temperature Range	0°C to 50°C
Temperature Resolution	0.1°C
Temperature Accuracy	±0.5°C
Battery	1 × CR123
Battery Replaceable	Yes
Expected Battery Life	Approximately 3 years
Low Battery Reporting	Yes
IP Rating	IP20
Operating Temperature	0°C to 50°C
Relative Humidity	10%–95% RH, non-condensing
Dimensions	Ø65 × 40 mm
Weight	0.126 kg
Color	White
Certification	DIN EN 14604
Additional Listed Standard	DIN 14676
CE	Conforming
RoHS	Conforming
REACH	Conforming
GTIN / EAN	5713594002330

Product specifications are based on the official frient product page and the supplied Reichelt listing.

Compatibility

Platform / Use	Compatibility
Zigbee 3.0 Gateway	Required for connected features
Zigbee2MQTT	Yes
Home Assistant via Zigbee2MQTT	Yes
Home Assistant ZHA	Reported working, functionality may vary by integration
Smoke Detection	Yes
Temperature Reporting	Yes on supported integrations
Battery Reporting	Yes on supported integrations
Smartphone Notifications	Yes through a compatible Zigbee platform
Direct Wi-Fi	No
Direct Bluetooth	No
Zigbee Mesh Router	No, battery-powered end device
Outdoor Use	No

Zigbee2MQTT has a dedicated device definition for SMSZB-120. Home Assistant ZHA users have also reported successful pairing, although the precise entities and controls exposed can differ between Zigbee integrations and software versions.

What's Included?

• 1 × frient Intelligent Smoke Alarm SMSZB-120
• 1 × CR123 battery
• Installation components supplied with the alarm

The official manufacturer documentation confirms that the smoke alarm is battery powered with a replaceable CR123 cell. Exact accessory packaging can vary by sales channel.

How to Set Up the frient Zigbee Smoke Alarm

Step 1: Install and Power the Alarm

Install the CR123 battery and mount the detector according to the supplied installation instructions.

Step 2: Pair with Your Zigbee Gateway

Put your compatible Zigbee coordinator or gateway into pairing mode and reset or pair the SMSZB-120 as instructed.

Step 3: Test the Smoke Alarm

Use the detector's physical test procedure and confirm that the local siren operates before relying on connected notifications.

Where Should You Install the frient Smoke Alarm?

Smoke alarm placement is safety-critical and should follow the installation manual and the regulations applicable to your property.

The device is designed for indoor use and operates between 0°C and 50°C with an IP20 enclosure.

Do not install it in locations outside the environmental limits specified by frient.

For required alarm quantity, room placement, ceiling distances and special locations such as kitchens, garages or bathrooms, follow the applicable local fire-safety rules rather than a generic smart-home installation guide.

Important Safety Notes

The frient SMSZB-120 is a smoke alarm first and a smart-home sensor second.

Keep these points in mind:

• Do not depend only on smartphone alerts.
• Test the local alarm regularly according to the manufacturer's instructions.
• Replace the battery when a low-battery condition is indicated.
• Do not block or cover the smoke detector.
• Keep the detector within its specified operating conditions.
• Follow applicable smoke-alarm installation regulations.
• Do not disable the local siren simply because the alarm is connected to a smart-home platform.
• Smart-home automations should supplement, not replace, certified fire-safety equipment.

Pros

• Zigbee 3.0 connectivity
• Loud 85 dB local alarm
• Optical smoke sensor
• Built-in temperature monitoring
• Replaceable CR123 battery
• Approximately three-year battery life
• Low-battery reporting
• Zigbee2MQTT support
• Home Assistant integration possible
• Compact 65 mm diameter
• DIN EN 14604 certified
• Remote alert capability through compatible gateways
• Temperature and battery entities can be exposed to smart-home systems

Cons

• Requires a compatible Zigbee gateway for connected notifications
• IP20 means indoor dry-location use only
• Battery-powered device does not strengthen the Zigbee mesh
• Smart-home features can vary depending on gateway or integration

Who Should Buy the frient Zigbee Smoke Alarm?

The frient Intelligent Smoke Alarm SMSZB-120 is well suited to people who want a certified local smoke alarm combined with Zigbee monitoring.

It is particularly useful for:

• Zigbee smart-home users
• Home Assistant users
• Zigbee2MQTT installations
• People who want remote smoke notifications
• Holiday homes
• Second homes
• Apartments
• Users who want battery and temperature data in their smart-home dashboard

A compatible Zigbee gateway is required if you want connected alerts or smart-home integration.

Frequently Asked Questions

What is the frient Zigbee Smoke Alarm?

The frient Intelligent Smoke Alarm SMSZB-120 is a Zigbee 3.0 smoke detector with an optical smoke sensor, 85 dB local siren, replaceable CR123 battery and built-in temperature sensor.

Who should buy the frient Zigbee Smoke Alarm?

The frient Zigbee Smoke Alarm is suitable for users who want local smoke detection combined with Zigbee monitoring, remote notifications and smart-home integration through a compatible gateway.

How does the frient Zigbee Smoke Alarm work?

The alarm uses an optical sensor to detect smoke and activates its local 85 dB siren when an alarm condition occurs. Through Zigbee, a compatible gateway can also receive smoke, battery and temperature information.

Does the frient Smoke Alarm require a Zigbee gateway?

The local smoke alarm works as a smoke detector, but a compatible Zigbee gateway is required for connected functions such as smartphone notifications and smart-home monitoring.

Does the frient SMSZB-120 work with Zigbee2MQTT?

Yes. Zigbee2MQTT has a dedicated SMSZB-120 device definition and exposes smoke, battery, temperature, fault and other supported states.

Does the frient Smoke Alarm work with Home Assistant?

Yes. The SMSZB-120 can be integrated with Home Assistant through Zigbee2MQTT, and users have also reported successful ZHA pairing. The exact entities available can vary by Zigbee integration and software version.

How loud is the frient Zigbee Smoke Alarm?

The integrated siren is specified at 85 dB measured at 3 meters.

How long does the battery last?

frient specifies an expected battery life of approximately three years using one replaceable CR123 battery with reporting every five minutes. Actual life can vary with usage and Zigbee conditions.

Why Buy the frient Zigbee Smoke Alarm?

The frient Intelligent Smoke Alarm SMSZB-120 combines a certified optical smoke alarm with Zigbee 3.0 connectivity, making it useful for people who want both local fire warning and smart-home monitoring.

Its 85 dB siren provides the immediate local alert expected from a smoke alarm, while connected platforms can add remote smoke notifications, battery monitoring and temperature data.

For Home Assistant and Zigbee2MQTT users, the SMSZB-120 is particularly useful because supported integrations can expose much more than a simple alarm state, including battery, temperature, fault and reliability information.