Multifunctional LED Emergency Light Bulb with USB Charging, Ideal for Power Outages, Camping Tent, Fishing Long Lasting Power With a built-in battery, this LED emergency bulb can provide continuous lighting for 7-48 hours on a single charge, allowing you to stay prepared for any situation. High-quality material: The rechargeable LED bulbs are made of high-quality ABS material, which is safe, environmentally friendly, durable and drop-proof. ● Wide applications: Rechargeable energy-saving LED bulb, suitable for a variety of places. ● Controllable Brightness: Five gears to adjust the brightness you need. ● USB Charging Modes: DC 5V USB Fast Charging. ● High Capacity: Built-in 5V/2400mAh lithium battery with 4~12 hours working time according to different gears. ● Intelligent power supply inside: over-voltage and over-current protection IC to ensure safety. ● High quality: Portable light beam, soft, glare-free, elegant and elegant appearance.