LFI Lights - UL Certified - Hardwired Green LED Self Testing Exit Sign - Battery Backup Emergency Lighting - LEDGBBST Meets or exceeds UL924 (21 separate tests), NEC, OSHA & NFPA 101 Life Safety Code requirements 120 or 277 VAC operation Universal mounting canopy for top or side installation NiCad battery 4.8V 700mAh Self Test