Bosch Smart Home

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Twinguard: Smart smoke detector with added value

A smoke detector is an invaluable asset to your home to protect you against the dangers of fire. The Twinguard is constantly on alert for the detection of fire, so much so that it continuously measures the temperature, humidity and air purity so that you experience an optimum level of comfort around the clock. It offers you and your family safety at all times and simultaneously improves the climate in the room. The Twinguard Starter Kit is the ideal starting point for optimising the climate of your room and includes the all important Twinguard Gateway to combine other Twinguards in your home.

Twinguard Starter Set


129.95GBP * Including 20% VAT
Delivery: 3 - 4 working days with UPS
  • Reliable smoke detection with professional Dual Ray technology
  • Optimum smoke sensor sensitivity for each room type
  • Automatic forwarding of alarms to a smartphone
  • Continuous measurement of temperature, relative humidity and air purity
  • Recommendations for healthy air quality and notifications when values are outside the optimum ranges

The innovative smoke detector detects smoke immediately and sends an alarm – and, thanks to the integrated air quality measurement, helps you optimise inside air.

Twinguard App

  • Serves as central indicator and control element for all integrated Twinguards
  • Ensures continuous access to current and historical air quality measurement data from your Twinguards – from at home and on the go
  • Reliably forwards alarms from the Twinguard to your smartphone
  • Makes it possible to trigger test alarms from your smartphone
  • Displays the current status of your Twinguard's batteries
  • Compatible with smartphones with Android 4.4 or iOS 8 or higher


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

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. You can return used batteries of models that we stock or have stocked in our product line to our shipping warehouse (Bosch Thermotechnik GmbH, Spare parts logistics, Justus-Kilian-Strasse 1, D-35457 Lollar) at no charge.

    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.


Can I pre-order the Bosch Smart Home Twinguard?

If you register as a customer, you can reserve the product on the respective product page ("Reserve product"). We will provide you with exclusive notification as soon as your Bosch Smart Home Twinguard will be available.

How does the Dual Ray technology differentiate from conventional smoke detecting techniques?

Every day, smoke detectors with Dual Ray technology reliably protect thousands of industrial-sized buildings such as shopping centres, office complexes and airports. The high-precision technology reliably detects even the finiest smoke particles. Dual Ray works with 2 LEDs in the blue and infrared range. The result is exceptionally reliable fire detection with as few false alarms as possible.

Dual Ray Technology features Intelligent Signalling Processing (ISP) based on Bosch's decades of experience in professional fire detection.

How does the Bosch Smart Home Twinguard calculate the optimum air quality?

Dedicated algorithms analyse the different data which have been recorded and visualise the result in the form of leaf symbols for the room you are monitoring. The Bosch Twinguard app has stored data on the optimum air quality range for various room types, such as bedrooms, which are based on scientific studies. These are used as a reference.

How can I install the Bosch Smart Home Twinguard?

To install the Bosch Smart Home Twinguard, use the wall plugs and screws provided. The easiest way to install your Bosch Twinguard is to watch the step-by-step instructions in our installation video or alternatively download the user manual. Please note: Your Bosch Smart Home Twinguard has not been approved for glued installation.

Which app do I need in order to use the Bosch Twinguard?

You need the Bosch Twinguard app in order to set up and control your Bosch Twinguard. You can download the Bosch Twinguard app free of charge from the Google Play Store (for Android smartphones) or the Apple App Store (for iPhones).

More FAQs about this product can be found here

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