Unifying Receiver
  Device path  : /dev/hidraw2
  USB id       : 046d:c52b
  Serial       : C03E9E2E
    Firmware   : 12.01.B0019
    Bootloader : 02.14
  Has 2 paired device(s) out of a maximum of 6.
  Notifications: wireless, software present (0x000900)
  Device activity counters: 2=118

  2: Wireless Keyboard K270(unifying)
     Codename     : K270(unifying)
     Kind         : keyboard
     Wireless PID : 4003
     Protocol     : HID++ 2.0
     Polling rate : 20 ms (50Hz)
     Serial number: FE8C8542
          Firmware: RQK 35.00.B0017
     The power switch is located on the top case.
     Supports 12 HID++ 2.0 features:
         0: ROOT                   {0000}   
         1: FEATURE SET            {0001}   
         2: DEVICE FW VERSION      {0003}   
         3: DEVICE NAME            {0005}   
         4: BATTERY STATUS         {1000}   
         5: unknown:1820           {1820}   hidden
         6: REPROG CONTROLS        {1B00}   
         7: WIRELESS DEVICE STATUS {1D4B}   
         8: unknown:1DF0           {1DF0}   hidden
         9: unknown:1DF3           {1DF3}   hidden
        10: ENCRYPTION             {4100}   
        11: KEYBOARD LAYOUT        {4520}   
     Has 8 reprogrammable keys:
         0: Play/Pause                 => Play/Pause                    nonstandard
         1: Mute                       => Mute                          nonstandard
         2: Volume Down                => Volume Down                   nonstandard
         3: Volume Up                  => Volume Up                     nonstandard
         4: MY HOME                    => HomePage                      nonstandard, reprogrammable
         5: Mail                       => Email                         nonstandard, reprogrammable
         6: SLEEP                      => Sleep                         nonstandard, reprogrammable
         7: Calculator                 => Calculator                    nonstandard, reprogrammable
     Battery: 90%, discharging.