Rotatable Keypad for iPad2 Latest Smart Design 3-in-1 Functional Keyboard 1. Built-in wireless bluetooth with BROADCOM bluetooth chipset2. iPad2 uniqu keypad with stander & cover function3. Built-in rechargeable lithium battery; full-charging time: 3~4hrs4. Built-in smart charging management chipset and charging indicator5. Low-Power Indicator 6. Caps-Lock Indicator 7. Keypad with Scissors-Kick Design, Light & Easy-Taking8. Specialized Sleep-Mode to save energy  ** Standard Bluetooth 2.0 Interface** Working Distance: up to 10m** Frequency: 2.4GHz ** Operating Voltage: 3.5~4.2V** Operating Current: <5.0MA** Standby Current: 2.5mA** Sleeping Current: <700μA** Charging Current: ≥150mA.** Standby Time: 30 days ** Charging Time: 3~4hrs ** Charging-Discharging Times: ≥500** Battery Life: 3-years ** Keypad Dynamics: 80±10g** Life of Keypad: up to 5000K times** Operating Temperature: -10 - +55°C** Operating Humidity: 20%-50%