
The Philips Hue line of lights have been controllable via an indoor motion sensor for some time, but Signify is today introducing an Outdoor Motion Sensor that's designed to control the range of outdoor Hue lights that are now available for purchase.
The Outdoor Motion Sensor works just like the indoor Smart Motion Sensor, automating your lights and other HomeKit products to come on when motion is detected and turn off when there's no motion detected, all on an automatic basis.

As with all Hue products, the Outdoor Motion Sensor is designed to work with a hub, so a Hue hub and Hue lights are required to use the product, even though it can interface with other HomeKit devices.
Design
The Outdoor Motion Sensor is small and relatively unobtrusive, but it does have a design that stands out somewhat, so it's not entirely unnoticeable. It features a square-shaped plastic housing with a protruding white circle where daylight and motion sensors are built in.

At the back, Outdoor Motion Sensor features a mounting plate and a variety of mounting options so you can put it wherever it works best. There's an option for a flat wall or mounting it at a corner, which would allow for maximum view of a driveway, lawn, or entryway.

I live in an apartment so I'm not able to do wall mounting, but I'm including this image of the Outdoor Motion Sensor from Amazon to show the different ways that it can be mounted -- flat, on an inward corner, or on an outwards-facing corner. For testing purposes, I have tall shelves outdoors where I keep plants, which is what I used, so it also doesn't necessarily need to be permanently mounted to work well.

You can screw the Outdoor Motion Sensor into the wall outside, and the hardware that you need is included (wall brackets, screws, and screw plugs), making it simple to get up and running. There is a built-in battery inside the Outdoor Motion Sensor that's supposed to last for about two years, so you don't need to worry about charging it. It's using AA batteries, so when the included batteries are exhausted, it won't be a hassle to get a replacement.
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Article Link: Review: Weatherproof Hue Outdoor Motion Sensor Lets You Automate Your Indoor or Outdoor Lights