Feature: 1. 【Rechargeable and Portable】: This 40W USB rechargeable light bulb is equipped with a built-in 500mAh lithium battery, allowing for easy charging through a USB cable. It is lightweight and compact, making it perfect for indoor use, camping, hiking, fishing, backpacking, and even hanging in tents. 2. 【Three Levels Adjustable】: With 5 levels of brightness adjustment, this wireless light bulb provides you with customizable lighting options to suit your needs. Whether you need a soft glow for ambiance or a bright light for reading or working, this light bulb can be easily dimmed to your desired level. 3. 【Versatile Hanging Design】: Featuring a convenient hook, this emergency light bulb can be effortlessly hung in your tent, indoors, or anywhere you need illumination. Additionally, it can also be placed on a table or any flat surface, providing you with flexible lighting solutions wherever you go. 4. 【Energy Efficient and Long-lasting】: With a luminous flux of 180lm, this rechargeable light bulb offers efficient and reliable lighting. Its energy efficiency level 1 ensures minimal power consumption, saving you money on electricity bills. The durable design and quality materials make it a long-lasting lighting solution for your home or outdoor adventures. 5. 【Multi-purpose Usage】: This rechargeable light bulb is not only suitable for emergency lighting during power outages but also serves as a versatile lighting option for various activities. Whether you are camping, hiking, fishing, or simply need extra illumination at home, this USB rechargeable light bulb is the perfect choice. Specification: Input Voltage: 5 (V) Luminous Flux: 180 (lm) Lamp Body Material: Plastic Lampshade Material: PC Gear: 5 adjustable gears 1 Gear: High brightness 2 Gear: Normal brightness 3 Gear: Low brightness 4 Gear: Flash 5 Gear: SOS Energy Efficiency Level: Level 1 Power Supply: Built in 500mAh rechargeable lithium battery Product Power: 40W Product Quantity: 9 pieces per pack Product Size: 6.6 * 6.6 * 12.3cm/2.6 * 2.6 * 4.8inch Package List: 9 * Emergency Light Bulbs9 * Hanging Hook1 * USB Cable