REDRAGON GASKET OUT - The body structure differs from traditional screw fixing by using precision-locked covers with gaskets to assist with noise reduction and flexibility. It provides even feedback while the vertical cushioning reduces rigid noise, delivering a crisp, clean and softer typing feel. 3-Mode Connection - Geared with Redragon advanced tri-mode connection technology, USB-C wired, BT 3.0/5.0 & 2.4Ghz wireless modes which make the user experience upgraded to another level in all fields. Custom Mint Mambo Switch - With thick-lubed custom linear switches combo with a gasket form factor, K689 PRO features cushioned rich linear travel with silky creamy and cozy typing feedback. The brand new upgraded socket is nearly all switches(3/5 pins) compatible. Noise Dampening x 3 - Equipped with 3.5mm PO foam, IXPE switch foam, bottom socket foam, along with the silicone gasket. Significantly reduce the hollow noise, creating dampened and ultra-clean typing acoustics, making each keystrok