In the past few years, we have covered plenty of cool home security cameras from Arlo. Their All-in-One Sensor is also worth a look. It is a smart sensor with 8 functions that lets you keep an eye on unexpected activity in your home. It works as a motion sensor, water leak detector, and freeze sensor. You can also use it to detect when windows and doors open or close.
The Arlo All-in-One can also listen for your smoke or CO alarm but you are going to need the Professional Monitoring plan. This battery powered sensor has a very compact design (1.5 x 0.6 x 2.4 inches). You can set up one or multiple detection functions through the Arlo Secure App.[HT]