Emergency light, with 2 lamps each 18- 20 watts each, operates automatically on power failure, with one battery 6V 4AH, lead acid sealed maintenance free, that works when fully charged for more than 2 hours for two lamps and more than 3.5 hours on single lamp, it contains protection circuits for the batteries and the lamps (over charge and over discharge protection electronic circuits (never present in most other products) with two years guarantee.