[3 Modes for Versatile Use] The mouse comes with 3 different modes, BT5.0/2.4Ghz/USB-C, allowing you to use it wirelessly or with a cable. [9 kinds of colourful light effects] Support multiple light effects switching, adjustable brightness and turn off the light. All-key interchangeable shafts and exquisite keycaps. Product model:K21 mechanical keypad Number of keys:21 keys Keycap material:PBT thermal sublimation Connection mode:Bluetooth/2.4G Wireless/Wired Product size:82.9 x 121 x 36.4mm Type:A: Colour:As Shown Material:ABS Package Contents: 1 * 21-key mini keyboard 1 * Data cable 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.