TITLE Four 5mm Super-Bright Round LEDs for Bright Diffused Light (One LED Can Provide Up To 16 Hours of Light) 5mm Photosensor with 40-60KoHM sensitivity at 10 lux 120V AC or battery back-up with three 1.2V rechargeable batteries producing 1300mAh Up to 16 hours of emergency lighting during power failures Perfect for In-Door Use During Thunderstorms, Blackouts, Ice Storms, and Hurricanes