The Product Is A Pack Of Two Hardwired Emergency Exit Light Fixtures For ? Battery Backup: Comply with UL 924 Emergency Lighting and Exit Sign Regulations; built-in 3.6V 1000mAh rechargeable battery, more than 90mins continuous lighting for emergency after power failure, longer illumination, more reliable ? Easy Installation: Surface mount via back plate, all the mounting hardware and accessories included in package, save the time and trouble of purchasing extra mounting parts ? Ultra Brightness: With 12 high-grade LED chips per head, dual-head design brings high brightness for emergency, two voltage levels available, AC120V for general household lighting and AC277V for commercial or industrial lighting ? Wide Applications: Keeps off when the power is connecting while lights up when power failure, suitable for basements, auditoriums, restaurants, shopping malls, super markets, schools, etc ? Quality Assurance: UL-listed for safe operation and first-class quality; impact resistance, thermoplastic housing; come with a 2-year warranty, extra protection for you