WP-CEP-12C-200VPE1 LED Emergency Battery Backup LED Drivers, using compact metal case,with external installation, is connected between AC source and LED luminaries, without any change to the original structure. With built-in LiFePO4 battery, constant Emergency output power 12W, High Power Factor over 0.9 while charging, it is adapt to 100-347Vac grid and 0-50C working environment.