1）bluetootth 3.0 interface standard      2) operating distance to 10m                    3)80key                                                   4) operation voltage 33.0-5.0V        5)work current:<5.0MA                            6)standby current:60days                             7) sleeping current <200ua                      8)CHARGING CURRENT:>100MA                   9) standby time:60days                            10)charge time:4-5hours           11)lithium battery capacity:>420MA        12)lithium battery life :3years                        13)  key life:5million strokes
bluetooth keyboard case for google nexus7 ,