2 packs of 2 sensors. Unopened. Price is for one pack of two; two packs available. Place sensors in the rooms that matter most to experience comfort that stays with you Works with all ecobee thermostats to deliver comfort where it counts and help manage hot or cold spots Detects motion to deliver comfort when you’re home, save energy when you’re away, and adjust temperature in rooms that are in use Works with ecobee Smart Security to send notifications when motion is detected No wires. Installs in seconds Use the ecobee app to check and adjust the temperature in rooms you’d like to monitor.