Overview Reviews Product Description Leviton OSA20-R00 Occupancy Sensor Add-A-Relay/with HVAC Relay. Product Videos Custom Field Product Reviews Write a Review Write a Review × Leviton Leviton OSA20-R00 Occupancy Sensor Add-A-Relay/with HVAC Relay Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *