USB Mode: Switch to this mode by pressing Fn+U (Akko Cloud Driver can only be used in this mode) Bluetooth Mode: Compatible with BT5.0 and can connect to 3 devices, which can be switched by Fn+E/R/T 2.4GHz Mode: Switch to this mode by pressing Fn+Y, while the receiver is plugged in. Hot-swappable switches: Switches can be pulled out and replaced with your desired switch with the included switch puller Programmable: Macro can only be programmed in wired mode through Akko Cloud Driver, and can be called in every mode without the software Keycaps: Cherry Profile - Double Shot PBT keycaps