Power Sentry(R), Electronic, Emergency Fluorescent Ballast, Input Voltage 120 to 277V AC, Number of Bulbs Supported 1, 2, Max. Bulb Watts 86 W, Quad Tube, T5, T5HO, T8, T8HO, Triple Tube, Twin Tube Ballast Bulb Type, Initial Lumens 800 to 1500 lm, Thermoplastic/Metal Housing Material, 13 5/16 in Length, 2 3/16 in Width, 1 3/16 in Height, Low Profile, 90 min Emergency Illumination Time, 24 hr Recharge Time