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Power Source: Electrical Type: Negative Ion Installation: Portable, Necklace Wearable Certification: CE Capacity (CFM): 20 Power (W): 1 Voltage (V): 5 Brand Name: AVICHE Model Number: W3 Application: Home, Office, Ward of hospital, Car, Neck Wearable, Travelling Function: Release negative ions to remove Smoke, PM2.5 Size: L80xW37xH24mm Negative Ion Generator: >5 millions pcs/cm3 Power supply: Built-in Rechargable Lithium battery Rechargeable: Rechargeable by USB Running time: 30-35h Charging time: 3-4h Batter Lifecycle: >500 times