Tri-mode Connection KeyboardThe wireless mechanical keyboard provides three connection methods, including Bluetooth 5.0, 2.4GHz wireless mode, and USB wired mode. It can be connected to up to five devices at the same time, and switch between them easily by FN+ combination keys. No limits about your keyboard connection to meet the needs of work, gaming, and study. Multi-Function KnobThe bluetooth keyboard with number pad has a knob, and it can adjust not only the volume, but also the lights. rotate to adjust volume; Short press to mute/unmute. Switch to Lighting Mode: Long press (3s) until backlight flashes twice. In Lighting Mode: Rotate to adjust brightness; Short press to cycle through 15 RGB effects.Switch Back to Volume: Long press (2s) until backlight flashes twice. Hot-swap Custom KeyboardThe hot swappable mechanical keyboard support 3-pin or 5-pin switches replacement. Even keyboard beginners can easily DIY there own keyboards without soldering issue. The mecha