Description: 8 million negative ions ultra-high negative oxygen Ion concentration, negative ion air necklace wearable, adjustable air filter, eliminating airborne pollutant particles. Achieves 1 cubic meter of air purification by releasing 8 million negative oxygen ions, bringing the same molecules found in natural retreats (beach, waterfall, or mountain) to by your side. You will feel like you are in nature. The generated negative ions will combine and eliminate pollutants and other unhealthy particles in the air by their static charge, forming a microscopic health shield. you can enjoy refresh and clean air at any time. Improve sleep quality; and ultra-quiet operation, to ensure your sleep quality while taking care of your dreams not to be disturbed. Mini, portable necklace design, stylish and convenient to carry; and the cute and beautiful design will be an exquisite gift. Specification: Material: ABS Battery Capacity: 300mah Charging Time: 50min Working Time: 24H Noise: Less Than 50db Area: Less Than 10sq meter Power: 0.1W Negative Ion Density: 8000000pcs/m³ Power Supply: USB Rated Frequency: 50HZ Size Chart: Size: 6.5x4.7x2.2cm / 2.56x1.85x0.87inch Package Includes: 1 Piece Air Purifier 1 Piece Lanyard 1 Piece USB Cable 1 Piece Manual Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement.