Specifications: USB Ionizer Airfreshener MINI USB PORT PIEZO-IONIZER Super Mini Fashionable Design Releases 2 Million Negative Ions Per Cubic Metre Clears Dust, Removes Smoke Improves Air Quality Piezo Ceramic Transformer No EMI PRODUCT DETAILS Woking voltage:5 Volts DC(computer power supply) Input power: Working current: Operating temperature:(32 ~ 104 0F) Operating humidity:20-80% Weight:24g Dimension:8.3 * 3.1 * 1.3 cm