Hubbell Building Automation UVPP Universal Voltage Power Supply for Low-Voltage OMNI and LightHAWK Occupancy Sensors, Black Self-contained transformer and relay that is designed to eliminate the guesswork in choosing the correct power pack to use with low voltage 24VDC occupancy sensors Supports and automatically detects input line voltage from 100-277VAC, eliminating the need for voltage-specific power packs or power packs that require special wiring based on the input voltage Capable of switching 20A loads and features Zero Arc Point Switching technology that minimizes relay contact wear associated with high inrush loads A single power pack can be used to supply power to up to four sensors, and can also be used to supply power to the MPSA auxiliary relay for multiple circuits Dimensions: 3.69 x 2.33 x 1.36-Inch