The smoke detector that provides your home with double protection.


Professional fire safety and constant air quality measurement combined into one device.

The Twinguard smoke detector not only warns you in case of fire, but also constantly monitors the indoor air quality in your home. Twinguard is a new member of the Bosch Smart Home System offering reliable protection - both in case of fire and burglary. Combined with other intelligent smoke detectors and Twinguards, it sounds the alarm and activates the smart cameras in the Bosch Smart Home. You are therefore always informed of what is going on in your home – even when you are not there.

Professional smoke detection

Thanks to unique Bosch dual ray technology the smart smoke detector provides maximum fire safety and sounds an unobtrusive advance alarm as soon as smoke develops. This lets you react immediately and take action if necessary.

Optimum room climate

Twinguard continuously monitors air quality, temperature and relative humidity and thus promotes healthier living. You can also activate an automation option that sends you a push notification when values leave the optimum range.

Smart system

By integrating it into the Bosch Smart Home System, the intelligent smoke detector offers now even more functions and benefits. For you, the main bonus is extra protection in the event of an emergency – both in case of fire and burglary. In addition, you can easily read the constant air quality monitoring values in the Bosch Smart Home App.

Twinguard - Smart forwarding

Smart forwarding to connected smoke detectors everywhere in your home

Stay on the safe side: as soon as a Twinguard detects smoke, it passes on a signal to all connected smoke detectors and Twinguards in your home. An alarm is immediately sounded on all smoke detectors. Even if you are in the cellar, you will still hear the alarm when the oil in the frying pan overheats in the kitchen so you can take action faster.

Twinguard - Always informed of the situation at home

Always informed of the situation at home

When smoke occurs, your smart Twinguard smoke detector not only activates the advanced warning, but all the indoor and outdoor cameras connected to the system as well. They begin recording and send live images directly to your smartphone to keep you best informed about what is going on in your home.

Twinguard - Scare off potential burglars

Scare off potential burglars

Add the Twinguard to your alarm system for comprehensive burglary protection. Door/window Contacts or Motion Detectors pick up intruders trying to enter your home. The siren of the Smoke Detector immediately raises the alarm and passes it onto all connected Smoke Detectors in your home. At the same time, the integrated Philips Hue lamps start to flash red. Scared off by acoustic and optical alarm signals the intruder flees – and the burglary is foiled.

Twinguard - Always perfect air quality

Always perfect air quality

The Twinguard helps you to create the atmosphere that you feel comfortable in. It continuously measures the constituents of the air in your room and notifies you when it deviates from the values that you have defined as optimum. Is the indoor climate in the children's room too stuffy at the moment? Flashing Philips Hue lamps in the living room draw your attention to this.

How it works

Ensuring good air in the room - all values at a glance

Ensuring good air in the room - all values at a glance

The Twinguard keeps an eye on the air quality: It continuously measures the most important air values of temperature, humidity and air purity in the room. You can read these values easily in the Bosch Smart Home App. If you wish, the app can also send you a push message when it's time to ventilate again.

Recognize yourself when to ventilate best

Recognize yourself when to ventilate best

Do not let bad room air arise at all: The app shows you the air quality throughout the day. You can see for yourself when the values leave the optimum green range and ventilate as a precaution. Over time, you will develop a better and better feeling for your air quality.


Differentiates between harmless candle fumes and the risk of fire to avoid false alarms
Notifies you when the alarm is sounded via the app with emergency number speed dialling
Can be connected to other Twinguards and Smoke Detectors
Customizable air quality limit values
Stores room air quality data for a period of three months
129.95 GBP
* Including 20% VAT

Further information

Technical Data

Product name
Smoke detector with integrated air quality sensor
Article number
440 g
Dimensions (H x W x D)
138 x 138 x 41 mm
Dimensions packaging (H x W x D)
182 x 181,5 x 102,75 mm
Country of origin
6 x 1.5 V AA alkaline batteries (replaceable)
Battery life
2 years (typical)
Wireless frequency
2,4 GHz ISM-Band
Wi-fi free field range
≥ 100 m
Transmitting power
8 dBm
Degree of protection
Ambient temperature
5 °C ... 30 °C
93% (non-condensing)
Bearing temperature
-5 °C ... +30 °C
This product does not comply with the Scottish regulations for fire and smoke alarms (1 February 2022) and may not be installed in Scotland.

Box contents

  • 1 Twinguard smoke detector
  • 6 alkaline AA batteries included and installed in the detector
  • 1 Installation plate for ceiling mounting
  • 2 Screws and wall plugs for ceiling mounting
  • 1 Installation guide
Notes about battery disposal

In conjunction with the sale of batteries or supply of devices that contain batteries, we are obligated to point out the following:

Used batteries should not be disposed of in the household rubbish. Consumers are obligated to take batteries to a suitable collection point provided by retailers or municipalities.

The symbols on the batteries have the following meaning:

The symbol of the garbage can crossed out by an X means that the battery must not be disposed of in household waste.

Pb = Battery contains more than 0.004 percent lead by mass, Cd = Battery contains more than 0.002 percent cadmium by mass, Hg = Battery contains more than 0.0005 percent mercury by mass

Please note the instructions above.

Download now

Bosch Smart Home App

Download the Bosch Smart Home App in your Apple App Store or Google Play Store.