Description: Upgraded Air Necklace with -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 50 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. Using pulsed needle tip technology to release 50 million negative oxygen ions, 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 5 decibels -quiet operation, to ensure your sleep quality while taking care of your dreams not to be disturbed. Environmentally friendly without consumables, the negative ion generator does not need to be replaced for life, saves worry and effort; and the elegant and beautiful design will be an exquisite gift for your lover. Specification: Material: ABS Plastic Size: 67x22x16mm/2.64x0.87x0.63 inch Package Includes: 1 Piece Wearable Air Purifier 1 Piece USB Cable 1 Piece User Manual Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-3mm differences due to manual measurement.