This is a Tridonic Em converterLED PRO 105 90V emergency lighting LED driver with a DALI interface and automatic test function. These are for use in self contained emergency lighting fixtures and led modules with a forward voltage between 40-97v. This driver is for use in non maintained operation and can be used in 1, 2 or 3 hour emergency duration. This should be used with a 5 cell battery. Tridonic article number 89800194