... wireless bluetooth keyboard 2.interface 2.0 3.Frequency: BT2.4-2.4835GHz 4.CE,Rohs,BT,FCC 5.one year warranty Specificationswireless bluetooth keyboard ... with mouse or withoutPerformance ParametersProcess: Broadcom Chipset with wireless Bluetooth 2.0 interface Frequency: BT2.4-2.4835GHz ... for your health with lowest radiates Operation distance: 10m Operating temperature:-10-55°C Workable environment:0- ...