Emergency LED Light, Dual Head, Designed To Reduce Egress System Cost & Maintenance As Well As Improve Reliability. Adjustable, Long Lasting Acculeds & A Sealed Nickel Cadmium Battery Ensure The Unit Will Function When A Predetermined Reduction Of AC Power Is Detected, Patented EZ Hang Feature Facilitates Quick & Easy Installation, Universal J Box Mounting Pattern & Keyhole Slots, Injection Molded, Made From A High-Impact Thermoplastic, Dual Voltage Input 120/240/277 VAC.