Leviton OSSMD-FTW Dual-Relay, Multi-Technology Wall Switch Sensor, Fan Model, 2400 sq. ft. Major Motion Coverage, 400 sq. ft. Minor Motion Coverage, White PIR and US technology for performance and sensitivity Controls two separate lighting loads from a single unit Manual-ON only for the secondary relay Features self-adjusting occupancy sensor technology with automatic "walk-through" sensing PIR can be disabled