The Athena Series (XASW02) LED Stairwell is specifically designedfor use in stairwells where the space is often unoccupied for longperiods of time. It reduces energy usage by up to 80% byautomatically providing full on light levels only when the space isoccupied and returns to power saving dim levels when the space isunoccupied. Xi-Fi wirelesslightingcontrolsystem links multiplefixtures and, together with a built-in occupancy sensor,automatically tracks occupancy so that the lights are at fullbrightness at the floors above, below and directly at the occupiedlocation, irrespective of the occupant's direction of travel. Thesefixtures function equally well in hallways, bathrooms, or any areathat is frequently occupied. Available with an optionalbattery back-up system if required (Xeleum PN: EC-010-2G-149).