size:hot-swappable brown switch | color:whiteintroduction: this is a rgb backlight mechanical keyboard with 61 keys.it supports wireless/wired dual mode connections to the device and compatible with windows/macos/android.it has various application designs,such as all keys without conflict,brilliant color backlit and control of hardware backlit   specifications: size:11.4x3.9x1.7 inches layout:61 keys backlight:rgb material:abs switch:blue or brown or red keyboard colors:black or white modes:bluetooth 3.0 and type-c usb voltage:5v systems support:windows xp/vista/7/8/10,ios,macos,linux,android   method of use combination keys? function press fn+left ctrl to switch to the second function of combination keys(except arrow keys).press fn+ctrl again,to restore the 9 keys main function y/u/i/h/j/k/n/m/<,but the other combination keys still in the second function.press fn+ctrl third times,all the combination keys? main function recovery.you can also lock/unlock arrow keys at any time by pressing fn+enter use the shortcut keys fn+a/s=switch win/mac fn+(f1-f12)=achieve functions such as: previous track,mute and so on(only for macos) adjust the backlight fn+(.>)=adjust backlight colors fn+(|)=switch backlight effects fn+([{), (}]), (;:), ('?)=adjust brightness and speed connect bluetooth 1.open the back switch of keyboard to "on" 2.select a group of bt modes to be connected through fn+q/w/e 3.press fn+q for a long time.at this time,the q key will flash,and the keyboard has entered the pairing mode 4.open the computer/mobile bt,search and connect the device 5.connect successfully,q key stops flashing package content: 1xrk61 mechanical keyboard 1xtype-c cable 1xkeycap puller 1xuser manual?3 modes connectivity? with 2.4ghz wireless, bluetooth, and usb wired 3 modes connection, this is a wireless gaming keyboard that no longer limits how you can connect. what?s more, in bluetooth mode, you can connect up to 3 devices. compatible with windows/ macos/ android.?61 keys compact design?no additional number keys, can meet you demands in office or home. the mini 60% mechanical keyboard is space-saving and portable, you will be satisfied at how much space you save.?hot-swappable brown switch?slightly quieter and easier to trigger than the blue switch. halfway between a typing and a gaming switch.some people prefer brown switch since it enables you to double tap faster and typists like them because they still have a good tactile feedback, but the audio feedback isn't quite as noticeable as blue switch.?rgb backlit?this 60% custom mechanical keyboard has 18 rgb backlight modes, 8 monochrome backlight modes and 1 full color backlight. these light modes can provide you a charming gaming environment at night.