Alexa's got a new gig: home safety. Amazon today introduces Alexa Guard, a free feature that uses the microphones of the Amazon Echo speakers to listen for the sounds of smoke and carbon monoxide alarms or breaking glass. Should the personal assistant hear any of those, it will send text alerts to your phone. Amazon says it's introducing the feature to "help you keep your home safe." Amazon says that security devices, such as the Ring video doorbell, which Amazon owns, or ADT Pulse, which it doesn't, can work with Guard in that Alexa will send the alerts to the security provider. Additionally, Alexa can be programmed to have smart, connected lights turn on and off remotely when you're out "to make it look like you're home while you're away," says Amazon.

If you suspect that your significant other is bringing others into your bedroom, you could have an adult conversation about it or seek couple's counseling. Alternatively, you can buy a 1,700 smart mattress called the Smarttress that will tell you when your partner is having sex with someone that isn't you. Smarttress is the invention of Durmet, a Spanish mattress company that was inspired by the fact that Madrid has the highest number of cheating spouses in Europe. It features 24 sensors within the springs, which the company calls the "Lover Detection System." These sensors know which areas of the mattress are receiving pressure and make a 3D map of the bed.