Working Voltage: 4.75-5.25VWorking Current Lower: 20MAButton life: More than 5 million timesStyle: mini keyboardSupport system: Win98/2000/ME/NT/XP/Visa/07/MacSerivice: 1 year quality guarranteen.Number of key: 110Function WaterproofPackage: one keyboard in a color box, 20 boxes in a carton.Speacial: USB keyboard