Input voltage : DC 12V/24VOutput voltage :220VUSB output:5VOutput current: 500mAInstruction:1. This power switch equipment is fit to most of mobile phone chargers， can't be used for another purpose.2. This product has the safeguard in currency， shortcircuit， over loading3. Plug this product into the cigarette socket4. Make sure the power indicator is bright5. Plug the mobile phone charger into this socket of this product6. This product is used for mobile phone， Personal Handy Phone System， travel charger. Can't be used to the ironheart transformerCaution:1. Some chargers with connector plugs reversely will not work， please counter change the direction.2. This product is specially used for cathode grounded car， cant be used for anode grounded car.3. This product is specially fit to DC 12V-24V car.