[High Concentration Negative Ion] 2 million/cm³ at a distance of 15 cm. Effectively absorbs formaldehyde, helps improve surrounding air quality, reduces second-hand smoke, and purifies the air. Removes most pollen, odors, smoke, cooking smells, and PM 2.5 particles. Helps maintain a purified environment for safe breathing. Simply plug it into a USB charging port. Fully charges in approximately 2 hours and provides continuous use for over 48 hours, delivering long-lasting fresh air. This portable ionic air purifier is ideal for individuals sensitive to airborne irritants. Operates quietly with noise levels below 25 dB, ensuring it does not disturb work or rest. No radiation is produced during operation, making it safe for use by pregnant women, children, and the elderly. Use it as a wearable necklace purifier in public spaces, during travel, or in areas with poor air quality to create a personal clean air zone. Compact and stylish necklace design, lightweight and easy to carry. Comfortable to wear for extended periods. Suitable for travel, combining fashion with functionality as an effective air purifier. Simple one-button operation—press and hold for two seconds to activate. [Great Gift Choice] Move beyond bulky traditional air purifiers. Enjoy personal air purification anytime, anywhere. A thoughtful gift for family, friends, or colleagues. Product Name: Portable Air Purifier Working Principle: Negative Ions Applicable Area: 1 Cubic Meter Function: Air Purification Anion Density: 2 million/cm³ Noise Level: Below 25 dB Voltage: DC 5V Power: 0.1 W Charging Time: Approximately 2 hours Battery Life: Over 48 hours Weight: 30g Dimensions: 55 x 17 x 60 mm Material: ABS Color: White Package Contents: 1 x Air Purifier 1 x USB Charging Cable 1 x Lanyard 1 x User Manual in English Note: The color may vary slightly due to lighting and screen settings. Measurement may vary by ±1-3 cm.