Features of Red Exit Sign LED Combo Emergency Light ???Superior Quality?- This LED Exit sign light Complies with UL 924 Emergency Lighting and Exit Sign Regulations; Injection-molded thermoplastic housing with engineering grade. 5VA flame retardant, high-impact resistant, continue to operate in case of fire or earthquake. Outages ???Reliable Operation?- UL-listed for safe operation and first-class quality, safety and interference resistant. Built-in Battery Backup, this emergency light is able to remain provides enough ample brightness for at least 90 minutes during power. 120V-277V AC universal voltage operation for wide places ???Flexible Installation?- end mount, hang mount and ceiling mount. The led exit lights fits standard size junction boxes, suitable for indoor damp location- Universal (top or back) mounting.easy to install, all the mounting hardware and accessories are included in the package ???Wide Application?- This emergency signs luminaire can be used in a 120V or 277V circuit for use at home, commercial and industrial lighting. It is suitable for apartments, doorways, churches, shopping malls, supermarkets, schools, hotel, restaurant office building and warehouses ?????After-sales Service Guarantee?-- OSTEK led Exit Sign with Emergency Lights have obtained UL certifications and are covered by worry-free MONEY-BACK and WARRANTY to address any defects or quality control issues. For a bulk order, email us in advance to obtain a different offer. If you have any LED technical questions or need design advice and installations, please feel free to contact us at any time.