... a negatively charged surface to produce adn expels an abundance of negative ions and cause suspended particles ... Illumine 100 hours.4. Car chargerConstant charging voltage, with IC control, best pure power, overload protection, ... chargerRetractable USB cable, 1M length, convenient use, connector with computer and phone can be charged directly. Also it ... Voltage: DC12V~24VOuput Voltage: DC5.25V±0.2