Note: This device is not intended for people with hearing problems it lacks a flashing strobe of light and the 85db alarm may not be enough in such cases. The Nest Protect runs self tests regularly every 200 seconds to see the status of the batteries and sensors and you can also run a full test to check at any time during this process, you’ll notice a blue light rotating around the button. If you have more than one Nest Protect detectors, you can interconnect them wirelessly the device supports the 802. 11b/g/n standard and Bluetooth Low Energy technology and, in case of an emergency, all the devices will speak at once telling you the location of the triggered alarm the devices shouldn’t be more than 50 feet apart from each other. The wired and battery models can be connected wirelessly up to 18 and you can also connect the Nest Protect with other Nest smart products such as the Nest Learning thermostat. Now, let’s talk about the elephant in the room or the Nest!: the security and privacy of your data.