lfi lights - 2 pack - ul certified - hardwired led emergency light standard - el2wbbx2 light fixture industries all led efficient and secure emergency light. long lasting, low maintenance nicad battery. no heavy, short-lived sealed lead acid batteries! works on either 120 or 277 vac. universal mounting plate. meets or exceeds ul924 (21 separate tests), nec, osha & nfpa 101 life safety code requirementssecond generation design features a sleeker frame with the same functionality and reliability you've come to trustif you received your unit with a heads popped out, please refer to the troubleshooting guide "lfi lights - el2 - head lamp assembly".