Features: This mini keyboard with custom functions.Type-C to USB interface, no driver, plug-and-play. New appearance, more powerful, lower power consumption; A-variety of RGB lighting effects The knob for pause/play-, volume-up, volume down and other functions, good helper for attendance. Support type-C and Bluetooth-compatible dual modes ; Upgrade version, 7 colors can be adjusted and five light modes can be used (the Bluetooth-compatible version also has lights when plugged in) Specifications: Item: Mini Keyboard Keys:4 Keys / 12 Keys Material: ABS- Mode:Bluetooth-compatible Size: approx 13.6x6x4.5cm/5.35x2.36x1.77in Color: Black Charge: Type-C USB Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-2mm error due to manual measurment. Package includes: 1 Piece Mini Keyboard