BLACKOUT BACKUP: Never be left in the dark during power outages. This LED rechargeable light bulb doubles as a standard light and emergency backup, delivering up to 12 hours of bright, reliable light wherever and whenever you need it. 4 LIGHT MODES: Switch between Fixture Mode (850 lumens) for everyday use and Backup Modes — High (500 lm), Medium (185 lm), or Low (80 lm) for up to 12 hours of power; easily cycle through settings with your wall switch or the power cap accessory. WORKS AUTOMATICALLY: This LED battery backup light bulb automatically switches on during power outages and recharges itself when power is restored; no manual charging or removal required, so you can go about your day (and night) worry-free. EFFICIENT VERSATILITY: This 8W LED light bulb uses 7.5x less energy than 60W incandescent bulbs; the power cap turns it into a portable light, and the hanging hook offers versatile placement for emergencies, workshops or everyday use. TECH SPECS: Size: 5.12" x 2.56" x 2.56"; Weight: 0.3 lbs; Includes: Power cap for handheld use; Power: 100-240VAC, 50/60Hz 8W AC compatibility with US & worldwide voltages, Lumens; 80 lm (Backup Low) – 850 lm (Fixture); Color Temperature: 3,000 Kelvin.