Superior Quality - Injection-molded thermoplastic housing with engineering grade. 5VA flame retardant, high-impact resistant, continue to operate in case of fire or earthquake. 90 Mins Duration - Built-in Battery Backup.High-density NiCd battery provides min 90 minutes of emergency operation time for LED lights during power outages. Battery is included in the box. Flexible installation - There are 2 types of installation including ceiling mounted and back mounted and it can be widely used in commercial facilities to provide emergency lighting in different locations. High Standard - Complies with UL 924 Emergency Lighting and Exit Sign Regulations. 120V-277V AC universal voltage operation for wide places. Worry-Free Shopping - We offer high quality products and professional after-sales support. If you have any questions or are not satisfied with the products, please contact us directly, we will do our best to help you solve your problem!