1、3 MODE CONNECTIVITY: The keyboard supports wired USB, wireless 2.4g and wireless Bluetooth connectivity, allowing users to choose the most suitable connection for their needs, which is convenient and flexible. 2、BLUE SWITCH: With blue switch mechanical keyboard design, the keyboard keys feel better and more comfortable to use, suitable for long time office and game use. 3、HID PROGRAMMING: The keyboard supports HID programming, users can customize the keyboard functions through the programming software download address to meet the personalized needs of different users. 4、MULTIFUNCTIONAL S KEYS: The keyboard is equipped with a multi functional S keys, which can be clicked to switch the key value layer, and each layer of key values can be set to different functions, allowing three keys to have nine key function customization to enhance the user's work and gaming efficiency. 5、LIGHTWEIGHT AND PORTABLE: The keyboard is designed in mini size, which is more lightweight and portable, making it easy to carry and use. Item Type: 3 Key Mini Keypad Material: ABS Connection: Wired USB, Wireless 2.4g, Wireless Bluetooth Switch: Blue Switch Mechanical Keyboard Battery Type: Built in 140mAh Lithium Ion Battery Applicable Devices: Computer General Purpose Multifunction S Key Description: Click to Switch the Key Value Layer, A Total of Three Layers of Key Value Layer, Each Layer of Key Value Can Be Set to Different Functions, So That the Three Keys Have a Nine Key Function Customization (Red Indicator Light Indicates That the First Layer, Green lamp the Second Layer, Blue lamp the Third Layer) 1 x 3 Key Mini Keypad (Ship with Inbuilt Battery) 1 x Data Cable 1 x Receiver 1 x Instruction Manual