SI-2880是一款2.4G、蓝牙(BLE5.2三通道)和有线3模82键机械键盘。支持连接5个设备，有线模式符合USB 1.1版本及其以上版本协议,适用于各种PC端。2.4G和蓝牙符合ISM（工业、商业、医疗业）频段自动跳频要求，有效避免无线装置之间相互干扰的问题。2.4G和蓝牙传输10米无障碍可视操作距离。
- 时尚的外观设计，82键布局，Gasket结构，手感细腻软弹。
- 键帽和机械开关可插拔，用户也可以购买市面上各品牌开关和个性化键帽自由DIY。
- 键盘用料扎实，按键反应灵敏。
- 独立收纳接收器。
- FN+\|组合键切换15种RGB灯效和关闭共16种灯效：随波逐流（恢复默认后灯效）、如影随形、正弦光波、旋转风车、七彩瀑布、花开富贵、游戏模式、关闭、常亮模式、呼吸模式、梦幻彩虹、一触即发、雨中漫步、按键涟漪、繁星点点、川流不息。
- 配合驱动带音乐律动RGB灯效，此灯效下有10种灯效模式可选。
- 有线模式与2.4G模式配合驱动各键带自定义功能，宏定义。驱动可自定义1600多万种颜色。
- 键盘人性化设计，与Fn配合增加一系列常用快捷功能按键。
- 开关拨到蓝牙模式BLE5.0/BLE3.0（设备名K75 5.0/K75 3.0）根据终端设备的蓝牙版本随机广播，可以连接3个设备：FN+1=蓝牙1 按键下蓝色指示 通道广播时蓝灯快闪，回连慢闪，连上蓝色亮2s；FN+2=蓝牙2 按键下蓝色指示 通道广播时蓝灯快闪，回连慢闪，连上蓝色亮2s；FN+3=蓝牙3 按键下蓝色指示 通道广播时蓝灯快闪，回连慢闪，连上蓝色亮2s。
- 开关切到中间=有线模式，4键上白灯亮2s。
- 三段开关切换模式：左=蓝牙模式，中=有线模式，右=2.4G模式。
- Fn+Esc长按三秒恢复默认。原来连接的蓝牙设备保存不会清除。
- Fn+↑=背光亮度增加，Fn+↓=背光亮度减少，Fn+←=背光速度减少，Fn+→=背光速度增加。
- FN+Q切换Android模式，FN+W切换Windows模式，FN+E切换Mac模式，切换后对应按键红灯闪烁。
- 左边独立CAP大小写指示灯。
- Fn+ \|切换灯效模式，Fn+Tab切换灯效颜色。
- Fn+左WIN=锁定/打开左WIN窗口键（锁WIN时锁WIN指示灯常亮，在WIN系统下）。
- 切换到Mac/IOS系统后左WIN/左ALT位置互换（不锁WIN）。
- FN+B切换右上角氛围灯条显示电量模式，充电时氛围灯绿灯指示，低电量红灯提示。
- 按住FN后提示当前3模式，蓝牙3通道，3系统对应按键下均亮白灯，松开恢复灯效。
- 蓝牙/2.4G模式下一分钟无任何操作自动进入省电模式，单击按键唤醒键盘。查看键盘电量连接蓝牙可以在电脑上显示。
- 键盘刷补丁需要切换成有线模式，刷完后重新插拔键盘线和键盘右上角的开关重新开关。
- 键盘回报率：有线模式1000Hz，2.4G模式1000Hz，蓝牙模式125Hz。
- 内置一个或两个5000mAh大容量锂电池可循环充电，带电源开关，环保节能，省心省钱，有效延长续航时间。
- 键盘蓝牙/2.4G/有线均支持全键无冲。
- Type C连接性更可靠，性能更稳定，充电更快。
- 配合驱动可调5档键盘响应速度，最快可达约“2.8ms”。
- 配合驱动在一般自定义功能上多增加3层自定义功能：支持双FN层可编辑，实现单键双组合功能，增加了TAP层实现一键两用，共有4层自定义功能。
- Sleek and stylish design with 82-key layout and Gasket mount, delivering a smooth and bouncy typing feel.
- Both keycaps and mechanical switches are hot-swappable, allowing users to freely customize with switches and personalized keycaps from various brands on the market.
- Premium build quality with solid materials and highly responsive keystrokes.
- Built-in dedicated storage compartment for the wireless receiver.
- Switch between 15 RGB lighting effects and off mode via the FN+\| key combination, totaling 16 modes: Wave Flow (default after reset), Shadow Follow, Sine Wave, Spinning Windmill, Rainbow Waterfall, Blossoming Prosperity, Gaming Mode, Off, Static, Breathing, Dreamy Rainbow, Trigger on Press, Rain Walk, Key Ripple, Starry Sky, Endless Stream.
- Music-sync RGB lighting available via dedicated software, with 10 additional dynamic modes to choose from.
- Full key customization and macro programming supported in wired and 2.4G modes via dedicated software, which also allows customization of over 16 million colors.
- User-friendly design with a range of common shortcut functions accessible via the Fn key.
- Toggle the switch to Bluetooth mode (BLE5.0/BLE3.0, device names: K75 5.0/K75 3.0). The keyboard broadcasts randomly based on the terminal device’s Bluetooth version and supports connection to up to 3 devices: FN+1=Bluetooth Channel 1 (blue indicator under the key: rapid flash for broadcasting, slow flash for reconnection, solid for 2 seconds when connected); FN+2=Bluetooth Channel 2 (same indicator behavior); FN+3=Bluetooth Channel 3 (same indicator behavior).
- Toggle the switch to the middle position for wired mode, with the white light under the 4 key illuminating for 2 seconds.
- 3-position mode switch: Left=Bluetooth mode, Middle=Wired mode, Right=2.4G wireless mode.
- Press and hold Fn+Esc for 3 seconds to restore factory default settings. Previously paired Bluetooth devices will remain saved.
- Fn+↑=Increase backlight brightness; Fn+↓=Decrease backlight brightness; Fn+←=Decrease backlight speed; Fn+→=Increase backlight speed.
- FN+Q=Switch to Android mode; FN+W=Switch to Windows mode; FN+E=Switch to Mac mode. The corresponding key flashes red after switching.
- Independent CAPS lock indicator on the left side.
- Fn+\|=Switch lighting effect modes; Fn+Tab=Switch lighting effect colors.
- Fn+Left Win=Lock/unlock the left Windows key (Win lock indicator stays solid when locked, only applicable in Windows system).
- The left Win and left Alt keys swap positions when switched to Mac/IOS mode (Win lock is disabled in this mode).
- FN+B=Toggle the top-right ambient light bar to battery level display mode. Green light indicates charging, red light indicates low battery.
- Press and hold the FN key to display current status: indicators under the 3 mode keys, 3 Bluetooth channel keys and 3 system keys all illuminate white. Release FN to resume normal lighting effects.
- Auto power-saving mode activates after 1 minute of inactivity in Bluetooth/2.4G mode; wake up the keyboard with a single keystroke. Battery level can be displayed on your computer when connected via Bluetooth.
- Firmware update requires wired mode. After update, please re-plug the USB cable and toggle the power switch on the top right corner off and on.
- Keyboard polling rate: 1000Hz (Wired mode), 1000Hz (2.4G mode), 125Hz (Bluetooth mode).
- Built-in one or two 5000mAh high-capacity rechargeable lithium-ion batteries with integrated power switch for energy saving and extended battery life.
- Full N-key rollover supported in Bluetooth, 2.4G and wired modes.
- Equipped with Type-C interface for more reliable connection, stable performance and faster charging.
- 5-level adjustable keyboard response speed via dedicated software, with a minimum response time of approximately 2.8ms.
- Dedicated software adds 3 extra layers of customization on top of basic functions: supports dual FN layer editing for single-key dual-combination functions; adds TAP layer for one-key dual-purpose functionality, totaling 4 layers of programmable customization.