Adjustable feet&2.4ghz receiver storage slot:The keyboard is designed to be better ergonomic as to provide more comfortable typing experience, this model has Adjustable feet to allow you to find the best height and set the perfect position for your typing, gaming or programming sessions.The seller is very kindly put the code on the backside label, you can download manual and driver by scan the code, or you can visit www.mathewkb.com to get it80% layout with 87 essential keys, striking an ideal balance between minimalistic design and full functionality. Hot-swap PCB allows you to replace 3 pins/5 pins switches freely without soldering issue. Enjoy the fun of making your own unique keyboard.prelubed and upgraded stablizer make your stroke more pure without any noise.Universal Type-c to USB interface is more convenient and widely compatiable with computer, also you can find replacement even the cable is broken.also the keyboard equipped with physical on/off button on the side for making sure you can adjust different mode fasterProgrammable driver: the mechanical keyboard supports macro settings, user can customize the custom keyboard through custom software. User can reset RGB backlight,key functions,macro settings. Customize the custom gaming keyboard according to user's preferences. This keyboard is widely compatible with Windows 7,8,10,XP,,MAC OS, etc., USB interface is plug and play. It does not affect the use without downloading driver software(driver only support win system)