Features: [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. [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. [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. [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. [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. Specifications: 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 Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-2cm measuring deviation due to manual measurement. Package List: 9 * Emergency Light Bulbs 9 * Hanging Hook 1 * USB Cable