High brightness and UL-924: Exit Sign with 360 rotation adjustable Twin Heads ,High Illumination (200lm)when Power Outage Long Duration Time:The Working time of emergency exit sign is more than 3 hours emergency duration time. Wide Input Voltage AC 85- 277V (50/60Hz) Multifunction Safety : Exit signs with emergency lights when power failure or unconnection,can turn on or turn off the emergency lamp. With US Standard Plugs Easy to Install:The exit signs for business with Plug in cord and L.N Wires,you can plug in with Socket or easy to connect wires,it is easy to charge and install ,fits all requirments and building standard for the various installation. The exit lights with emergency backup lighting with standard accessories and installation instructions inside Wide Applications:Emergency exit lights with battery backup when power failure, suitable for school, hotel, shop, supermarkets, restaurants, library, home, factories,building, etc