3-Mode ConnectionGeared with SURMEN advanced tri-mode connection technology, USB-A to C wired, BT 5.0 & 2.4Ghz wireless modes. Up to 3 devices can be connected via Bluetooth at the same time, and can be easily switched by the knob. Compatible with Win/Mac dual system, unlimited use. Noise Dampening,pleasing acoustic feedbackThe custom white linear switch is paired with a fitted silicone pad and sound-absorbing sponge to reduce cavity sound located between the PCB, along with the silicone gasket. Significantly reduce the sound resonance between the metals and reduce the cavities noise. Creating a clear and pure switch traveling sound ONLY, no extra string mushy noise. Pro Software SupportedThrough simple programming settings, you can configure multiple common operations into one click, greatly improving work and gaming efficiency. Macros with different keybindings or shortcuts for more efficient work and gaming. Hot Swappable & South-facing LEDs The SURMEN M75 Keyboard 75