
Fibaro has been making smart home devices and HomeKit-compatible products for a few years now, and the company has several sensors that work with HomeKit, including the Flood Sensor.
The Flood Sensor, along with the Button that we reviewed last year, are the two Fibaro branded HomeKit accessories available for purchase from Apple.

Fibaro's Flood Sensor is designed to detect water, which sounds super basic, but it's something that has the potential to save you a lot of money because if you've ever had a flood or a water leak, you know the kind of damage that water can cause to your home.
Design
When I saw the Fibaro Flood Sensor online it looked like a rather sizable device, but I was pleasantly surprised to find that it's actually small, unobtrusive, and able to go anywhere.
The Flood Sensor, made from a white plastic material, fits in the palm of my hand. It's round in shape with three corrosion resistant gold feet at the bottom that are designed to detect liquid. The feet are retractable at the ends which makes sure the sensor's feet are in contact with the ground even if the surface is a bit uneven.

"Flood Sensor" is written on one side of the device, and there's a Fibaro logo at the top. Inside the Fibaro Flood Sensor, there's a CR123A battery, which can be accessed by twisting the top of the cover counter-clockwise. This is also where the serial number is located.

You can put the Flood Sensor just about anywhere it will fit. It's just about an inch thick at its widest point, so you can tuck it into some tight spots. I have it located underneath a shelf in my living room, a spot where rain water has come in during heavy rains when the gutters outside of my apartment get full.

The feet on the Flood Sensor are small enough that it can detect even a small amount of water right away, which is useful for catching a leak before it gets too bad. If there is a lot of water though, it does float.
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Article Link: Fibaro's HomeKit-Connected Flood Sensor Notifies You When Leaks Are Detected