Upgrade your comfort with the Sensi Room Sensor, made exclusively for the Sensi Touch 2 Smart Thermostat. Sensi room sensors are designed to remotely monitor and control temperatures in different rooms of your home. When paired with the Sensi Touch 2 Smart Thermostat, room sensors can help reduce hot and cold spots by prioritizing or balancing temperatures where you need it most. 2 AAA batteries required per sensor.