aluminum bluetooth keyboard for google neuxs 7" Specification: Chipset: Broadcom 20730 Chipset * Frequency band: 2.4 - 2.4835 GHz unlicensed ISM band * Receiving sensitivity: -75bdm (standard) * RF output power: 4dbm maximum * Operating distance: 0 - 10 m * Bluetooth Version: 3.0 * Battery : Built-in Rechargeable Li-on battery * Power : Charges by USB 1.Bluetooth 3.0 interface standard 2.Operating Distance to 10 meters 3.Modulation System:GFSK 4.Operation Voltage;30.-5.0V 5.Standby time:60days 6.Charging Time:4-5 hours 7.Lithium Battery Capacity;160mA 8.Unimterrupted Working Time:55hours 9.platform: support android