A new Netatmo Security Sensor aims to provide maximum compatibility in terms of both hardware and software. As for the hardware, the device is two sensors in one, combining a door/window contact sensor with a motion detector… Software is equally flexible: the sensor supports Thread and Matter, meaning it's also HomeKit compatible. HomeKit News suggests that having two ways to detect the opening or closing of a door or window could make for more powerful automations.

[Dual sensors] may seem strange at first, but if you consider the possible automation options available to you when a contact sensor also detects that you are in your home rather than outside, there is the possibility of creating automations that work differently when you go out, about when you get home. Add to this that depending on where it is placed the motion sensor can do the regular kind of automations expected of it, then it really becomes a more attractive device […]
There's currently no word on a specific release date or pricing, but it's unlikely it will be as cheap as something like an Aqara motion sensor, though if it were priced relative to the price of the Aqara motion and contact sensors combined Well, it might be worth the extra. There's no word yet on pricing or availability, but expect to pay a premium for the device. The Netatmo security sensor will complement the growing range of smart home devices, including the carbon monoxide detector announced a few months ago. As we noted at the time, HomeKit compatibility can increase security over regular dumb detectors. If you're wondering why you might need a HomeKit-compatible CO detector, it can trigger automations, such as turning all the lights on to maximum brightness to aid in an evacuation. It can also warn you when you are not home so that you can warn relatives to stay out of the house. In the Netatmo promo video below, much more time is spent talking about the benefits of Thread and Matter support than the detector itself. FTC: We use auto affiliate links that generate revenue. Lake. Check out Homekit.Blog on YouTube for more Apple news: