Plastic box; • Input voltage (187-253)V AC, 50Hz; • Output voltage (18-27.6)V/DC; • Output current (in the presence of main power supply) – up to 2.0A (continuous); • Output current (in absence of mains power supply and fully charged back-up battery) – 3.5A up to 1h; • Back-up battery – 2x12V / 5Ah; • 5 Led indicators; • Developed under the requirements of EN 54-4.