(from Julien Danjou)

(solaar)
  2: Wireless Solar Keyboard K750
     Codename     : K750
     Kind         : keyboard
     Wireless PID : 4002
     Protocol     : HID++ 2.0
     Polling rate : 20 ms (50Hz)
     Serial number: 5692B2EC
          Firmware: RQK 33.00.B0015
        Bootloader: DFU 00.02.B0003
     The power switch is located on the edge of top right corner.
     Supports 11 HID++ 2.0 features:
         0: ROOT                   {0000}   
         1: FEATURE SET            {0001}   
         2: DEVICE FW VERSION      {0003}   
         3: DEVICE NAME            {0005}   
         4: REPROG CONTROLS        {1B00}   
         5: WIRELESS DEVICE STATUS {1D4B}   
         6: unknown:1DF3           {1DF3}   hidden
         7: FN INVERSION           {40A0}   
         8: ENCRYPTION             {4100}   
         9: SOLAR DASHBOARD        {4301}   
        10: KEYBOARD LAYOUT        {4520}   
     Has 12 reprogrammable keys:
         0: MY HOME                    => HomePage                      FN sensitive, is FN, reprogrammable
         1: Mail                       => Email                         FN sensitive, is FN, reprogrammable
         2: SEARCH                     => Search                        FN sensitive, is FN, reprogrammable
         3: Calculator                 => Calculator                    FN sensitive, is FN, reprogrammable
         4: MEDIA PLAYER               => Music                         FN sensitive, is FN, reprogrammable
         5: Previous                   => Previous                      FN sensitive, is FN
         6: Play/Pause                 => Play/Pause                    FN sensitive, is FN
         7: Next                       => Next                          FN sensitive, is FN
         8: Mute                       => Mute                          FN sensitive, is FN
         9: Volume Down                => Volume Down                   FN sensitive, is FN
        10: Volume Up                  => Volume Up                     FN sensitive, is FN
        11: SLEEP                      => Sleep                         FN sensitive, is FN, reprogrammable
     Battery status unavailable.