Photos: Smart-home devices

Liz Philips and her sons play rock-paper-scissors with “Alexa,” their wireless speaker and voice command personal assistant.

(Howard Lipin / San Diego Union-Tribune)

Oct. 5, 2016 1:35 PM PT

The refrigerator lets you know what foods are inside and steers you to online grocery shopping.

(Alex Wong / Getty Images)

The Roost Smart Battery for smoke alarms sends an alert to the user’s smartphone when the battery is low or activated.

(Robyn Beck / AFP/Getty Images)