Superlative optical performance up to 45 spacing; Eco-friendly, long-life, high-density LiFePO4 battery pack; Injection-molded UL 5VA flame-rated thermoplastic housing; Standard M2 includes two 1 Watt LED lamp heads; High-output M2-HO includes two 1.8 Watts high-performance LED lamp heads; Suitable for wall or ceiling mount; Self-diagnostics Standard; 90 minute emergency run time, 24 hour recharge time; Wide input voltage range of 120-277VAC, 50/60Hz; Standard finish: White; Suitable for Damp Locations; UL 924, cUL Listed and CEC Certified