This device is a small, American-made air ionizer worn around the neck, designed to remove airborne pollutants, viruses, and bacteria from the breathing space. Unlike other personal ionizers that bring or attract particles closer to the respiratory system, the patented SeLF technology repels particles, creating a removal zone of approximately 0.5 cubic meters around the person's head. The SeLF generator produces a powerful ion shield, preventing particles from entering the breathing space. A key difference is the output of the SeLF generator. The generated voltage is approximately 20,000V, which is significantly higher than the maximum 3000V of other products on the market. Ultra-lightweight, miniature size. Silent, fanless, filterless, and maintenance-free. Delivers cleaner, fresher air to your breathing zone. Solid platinum permanent emitter and gold-plated stainless steel collector. Battery life: 24-30 hours. Rechargeable in 2 hours with a USB charger. Dimensions: 8.7cm (length) x 7.5cm (width) x 2.5cm (depth) Weight: 43 grams Maximum operating temperature: 65°C * Scientific testing has demonstrated that the use of ReSPR surface and air purifiers significantly reduces the number of microbes on surfaces. These products are not intended to diagnose, treat, or cure any disease, nor are they a substitute for masks for normal or professional use as specified by official standards.