The new Cello Air™ damper product solves the problem with hot and cold rooms. Control the airflow into as many rooms as you like, or the entire house for continuous airflow balancing year round. Control from your phone, tablet or the Cello cloud. No gateway required. No thermostat dependency. No change to the home decor – Installs under the register. Battery powered up to 10 years! Solving comfort problems results in energy savings. Quick ROI.