Leviton OSP15-R30 Power Pack for Occupancy Sensor with HVAC Relay, 15 Amp FL, 347VAC 60Hz, Black Self-contained transformer & relay Regulated 24 VDC current, 150 mA output Mounts inside or outside junction box, or inside fluorescent ballast cavity Fast Installation Companion Add-A-Relay provides additional capacity (OSA20-R00)