10in Transparent Wireless Bluetooth Keyboard Multi Device Connect Backlight Ultra Thin Tablet Keyboard for Laptops Phones Black Item Type: Transparent Wireless Bluetooth Keyboard Material: ABS, Iron Plate Bluetooth 3.0: Standard MICR Interface Effective Operating Distance: Within Approx. 10meters / 32.8ft Modulation Mode: GFSK Operating Voltage: 1.8 to 3.6V Operating Current: <2.0mA Standby Current: 0.3 to 0.5mA Sleep Current: <40UA Charging Current: ≥200mA Standby Time: >30 days Charging Time: <2 hours Built in Polymer Lithium Battery: 400mAh Continuous Working Time: 44 Hours Key Force: 80±10g Key Life: 5 Million Clicks Operating Temperature: -10 to 55℃