Window and door contact – optical

Detect open windows in the app and link your heating or alarm function to the reliable window and door contact.

Window and door contact – optical

Open or closed – you notice it

You feel comfortable in your own home, and you should also feel safe. How about a device that not only ensures the optimum indoor climate, but also your security? Homematic IP transforms your own four walls into a feelgood oasis with unquestionable security. The window contact detects open windows, switches off the heating or, if desired, also triggers an alarm.

Colour variants

white

anthracite

Monitoring for a secure home

Opening or closing of windows or doors is detected immediately and is displayed in the Homematic IP app.

In combination with a Homematic IP alarm siren (e.g. HmIP-ASIR-2) your home becomes even more secure. A loud alarm is automatically triggered when a window or door is opened.

Adaptation to the window frame

Match your window contact to the look of your plastic or wooden frame window.

Two caps in white and brown are included for this.

Colour variants

white

anthracite

Fresh air without wasting energy

The room temperature is automatically lowered during ventilation if you connect the window and door contact to Homematic IP radiator thermostats.

You can even define the lowering temperature individually. The comfort temperature is automatically restored as soon as you close the window.

Händler finden

Installationspartner finden

Our products in a new dimension.

Rotate the product in all directions, zoom in and experience it in three dimensions. This gives you a detailed picture of your favourite products.

How to teach-in devices for room climate control

With Homematic IP controlling the room climate is easy. In this video we show you how to teach-in devices for room climate control like for example a radiator thermostat or an optical sensor that detects if the window is open or closed.

Your advantages at a glance

Do you want to live more safely, save money and protect the environment, or simply increase your living comfort? There are many good reasons for a Smart Home. Find out more now!

Your advantages at a glance

Do you want to live more safely, save money and protect the environment, or simply increase your living comfort? There are many good reasons for a Smart Home. Find out more now!

Alarm Siren – outdoor

Get a loud acoustic signal when someone tries to enter your home without permission. Install the smart outdoor alarm siren, and you’ll be able to keep an eye on everything via the app.

Radiator thermostat

Control your radiators the smart way - to ideally suit your daily routine. You can do this easily with the radiator thermostat.

Window and door contact – optical, plus

Detect open windows instantly and make your heating or alarm function even smarter. And do it easily via the window and door contact with its very long battery life.

05. July 2023

Travel with a safe feeling: How to protect your home with smart home technology

No one there to look after the house during the holidays? No problem, because your Smart Home protects itself: It keeps burglars away and lets you know immediately if something should happen.

Find out more

Homematic IP: Smart living. Simply exciting.

Homematic IP means modern, flexible and secure technology from the European market leader*. Let the advantages of our system win you over, and start living smarter straight away.

Homematic IP

With some smart home providers, you have to make a choice: Do you have everything wired, or do you go fully wireless? Some systems are also hermetically sealed and do not accept devices from other manufacturers. Here at Homematic IP, we have a different approach. We are guided by you!

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The Homematic IP app

Configure all the settings for your smart home in the Homematic IP app, and use it to control, regulate and monitor your devices whenever you want – without providing any personal data!

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Homematic IP Wired

A smart home system is particularly robust, interference-proof and reliable when the devices communicate with each other via wired connections. And data transmission is very fast with cables, too. That all comes together with Homematic IP Wired.

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Always here for you and your queries.

Whether you have a question about a product, something isn’t working as you wanted, you’re looking for a specialist partner, or you simply want to give us feedback: we are always here to help.

FAQs

This is where you’ll find the most important questions and our answers about our smart home solutions.

All FAQs

Service

Have you purchased a Homematic IP product and now have questions about how it works? Our technical support team will be happy to help you.

Specialist tradespeople

Are you looking for a good specialist tradesperson near you? Simply use the convenient search function here on our website.

Find a specialist tradesperson

Dealers

You can get Homematic IP products and good advice all over Germany. Find the right dealer near you here.

Find a dealer

Innovations, ideas, impulses: your news

Get first-hand news about the latest innovative smart home solutions.

View all news

Use Cases (field_use_cases)

Three new Homematic IP products available as anthracite design variants

eQ-3 presents three more Homematic IP products in elegant anthracite. The new design variant gives the pluggable dimmer, the pluggable switch and the desk stand a modern look that blends in perfectly with sophisticated living spaces.

02. December 2025

Improved operation of the Smart Home: New update for the free Homematic IP app

A new update for the Homematic IP app brings practical functions for an improved user experience. Among other things, switching actuators can now be provided with individual icons so that they can be assigned at first glance.

29. October 2025

Easy to install, noticeably comfortable: The new Homematic IP floor heating controller - 8 channels, motorised

From October, the proven Homematic IP floor heating controller with motorised valve drives will be available in a compact format. For convenient, energy-saving control of water-based surface heating systems and, of course, with automatic hydraulic balancing.

16. September 2025

Available from now on: The Homematic IP Access Point 2

Facelift for the Homematic IP Access Point: The Access Point 2 is visually similar to the Homematic IP Home Control Unit and will be available from August 2025.

04. August 2025

Product Variants

Window and door contact – optical

Window and door contact – optical

Order information

Product Name (Short)

HMIP-SWDO

Item Number

157857A0

EAN Code

4047976578573

Technical data

Supply voltage

1x 1.5 V LR03/micro/AAA

Current consumption

100 mA max.

Typical battery life

2 years (typical)

Degree of protection

IP20

Dimensions (W x H x D)

102 x 15 x 20 mm

Ambient temperature

5 to 35 °C

Weight

30 g (incl. batteries)

Radio frequency

868.0-868.6 MHz/869.4-869.65 MHz

Typ. open area RF range

300 m

Other

To enable operation, the device has to be connected with one of the following solutions: Homematic IP Access Point with free smartphone app and free cloud service, Central Control Unit CCU3 with the local user interface WebUI, Third-party solutions of partners