Working Principle:By using pulses and vibration of electric appliances, rise the original low voltage to for DC high negative pressure. Making use of for DC high voltage of carbon brush tip to produce high corona, emitt large amounts of electronic at a high speed. Electronics can not remain in the air for a long for time, therefore,after reacting with oxygen molecules in the air , negative ions will form.Features:Small size and high efficiency.This module is the finished module of transformer for small scientific production.Carbon fiber emission for head, strong and durable, good stability.It is effective to remove the debris in the air and it's benefits for your for health.Specification:Type: Double-headPK-D12FPower Supply: Car PowerApplicable Area: 11-20Air Purifier Volume: 50m/hInput voltage: D12VOutput voltage: DC-4.5KV1.0KVNegative ion concentration: 7x106PCS/cm(Test at 100mm)Insulation resistance: 40M(500V for DC)Dielectric Strength: AC3000V 50Hz 5mARated Power: 1WInput Current: 20mAO3 Concentration: 0.05PPMWorking Temperature: -10~50Working Humidity: 35%~85%Storage Temperature: -20~50I/P: D12V Red:+ Black:O/P: -DV2.0~6.0KVMaterial: ABS+Silicone LineDimensions: 42x24x21mm/1.65x0.94x0.83(approx)Color: BlackQuantity: 1 pcNote:Transition: 1cm=10mm=0.39inchNo retail package.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:1 x Negative Ion Generator(other accessories demo in the picture is not included.)