This small keyboard adopts PC high-transparency transparent shell and keycap, with transparent glass shaft, which is very cool under the rendering of lights. A great choice for your desktop. The K21 numeric keypad supports three connection modes: Bluetooth/2.4GHz/Type-C wired to meet different usage scenarios. Through Bluetooth mode, multiple devices can be switched freely, adapting to operating systems Windows/Android/IOS/MACOS. The 21-key numeric keyboard has 19 RGB lighting effects, which can be switched at will, and the translucent keycaps allow you to experience the e-sports atmosphere. Full-key hot-swappable design, experience the fun of customization. Supports most 3-pin/5-pin mechanical shafts on the market. The K21 numeric keyboard supports macro settings, and users can customize their personalized keyboard through custom software. Name:K21 three-mode connection hot-swappable numeric keyboard Glow:19 glow effects Connection :Bluetooth + 2.4G wireless + TYPE-C wired Product weight:180G Colour:B:Transparent-Black Material:PC Size:121x83x36.5mm Package Contents: 1 x keyboard 1 x data cable 1 x key puller 2 x shafts 1 x USB receiver 1 x multilingual instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.