Features: USB wired, no driver required, plug and play, easy and convenient to use. The OUTEMU blue switch provides strong mechanics, loud rhythm and clear percussion, bring you shock experience pleasure. 13 kinds of RGB light effects make your keyboard distinctive, easy to switch to meet your need. Adopt high keycap ladder design, sensitive typewriting, reduces error, provides comfortable hand feeling. Double-color key caps and large character spacing improve speed and accuracy, easy to locate and press the numbers you are looking for. Suitable for laptop user, cashier desk, bank, stock exchange, etc. Specification: Item name: Numeric mechanical keyboard : Model: K24 Material: ABS Color: Black Connection: Wired Interface: USB2.0 Switch: OUTEMU blue switch/red switch(optional) Key number: 21 Keyboard lifespan: 50 million times System support: Windows 2000/Windows 7/Windows 8/Windows 10/Windows Vista/Windows XP Item size: 13.2 * 8.6 * 4.2cm /5.2 * 3.39 * 1.65in(L * W * H) Item weight: Approx. 255g /8.99oz Package size: 18.5 * 14.5 * 5.5cm /7.28 * 5.71 * 2.17in(L * W * H) Package weight: 314g /11.08oz Packing list: 1 * K24 keyboard 1 * User manual