The Panasonic Emergency Light has been widely adopted around the world and in commercial applications such as hotels, hospitals, factories and corporate and government offices due to its ease of use and installation.The Panasonic Emergency Light, which is powered by two D-cell replaceable batteries (sold separately), can be easily wall-mounted anywhere fast access to lighting is needed. An automatic switch feature turns the Emergency Light on automatically when removed from its holder, providing the user with up to 18 hours* of portable, emergency lighting from its high-luminance krypton bulb.To save battery power when not in use, the battery is disengaged when returned to its holder. The exterior case of the flashlight also has markings which illuminate in the dark, making it easy to find when the lights go out. BatteryD-size x2 (not included) Bulb2.5V 0.5A Krypton Bulb x 1 (MB-25P5K) SizeBodyapprox. 40mm (Diameter) x 175mm, Holderapprox. 45mm (W) x 210mm (H) x 55mm (D) WeightApprox. 90g (without battery)Download product data sheet here.