Dual voltage input 120/277 VAC, 60Hz, Maintenance-free lead calcium battery, 20-gauge, die-stamped steel housing, Polycarbonate lens included, Adjustable aiming angle of 30°, Hanger bars accommodate 24" spans, Hanger bars can be rotated 90° on plaster frame, Four 1/2" and two 3/4" conduit knockouts, Trim ring with integral test switch held in place by torsion springs