ELCO Lighting KEM-HJ2 Relay BoxELCO Lighting KEM HJ2 KEM HJ2 Product Description ELCO Lighting KEM HJ2 Relay Box Features: Relay box for use with Low Voltage systems to adapt battery back up supply for emergency applications. About ELCO Lighting: Founded in 1991 by its president, Steve Cohen, ELCO Lighting develops and markets lighting products for commercial and residential applications. Founded on the philosophy that high quality commercial and residential lighting should be sold