, 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 HighImpact Thermoplastic, Dual Voltage Input 120240277 VAC