5 Keyboard Indicator Lights 
  Charging Indicator + Connection Mode + Operating System + Caps Lock + WIN Lock 
 
 Pressing and holding "FN" can check the connection mode and operating system of the keyboard 
  Charging Indicator: "FN+L_shfit" can switch the charging indicator light effect until it is turned off 
  Connection Mode: ~`=2.4g wireless mode, 1/2/3=BT1/BT2/BT3 mode   OS: Q=Android, W=Windows, E=MAC, Switching through FN+Q/W/E 
  Note: If the WIN key or Alt key stops working properly, use FN+Q/W/E/R to switch to the correct OS mode.