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Product Features: Mini,portable necklace design, stylish and convenient to carry. Multi functions to purify indoor air. Powerful function: release 5 million negative ion to purify air in a cubic meter. Easy to operate, one button for on/off. Rechargable lithium battery. No radiation. With perfect mute effect, no noise. Product Specification: Power Supply:USB Working principle:anions Applicable area:below 10m² Functions:air fresher Size: 4*4*1.5cm Net weight: 30g Noise: below 25dB Package List: 1* Personal Air Purifier 1* USB Charge Cable