Description:                                                             
◇Keyboard Format: 49 keys.qwerty layout        
◇Extended battery life for hours of typing          
◇Keyboard working distance: 0 - 10M
◇Battery: Built-in Rechargeable Li-ion Battery   
◇Constant use: About 50 hours                          
◇Standby: About 400 hours                                 
◇Charging time: 3-4 hours                        
◇Receiving sensitivity: -75dbm (standard)           
◇Frequency band: 2.4 - 2.4835GH unlicensed ISM band                                                                        ◇Frequency band: 2.4 -2.4835GHzunlicensed ISM band 
                                                                
System requirement:                                            
Mobile system requirement:
- Google Android 1.6 system or above
- Nokia Symbian S60 system or above
- Microsoft Windows Mobile 5.0 and above            
  Laptop system requirements:
- Wireless transmission enable PC running Windows 98 / ME
  / 2000 / XP / Vista
- Wireless transmission enabled Macintosh running Mac OS 10.2.8 or later