1. BLUETOOTH 3.0 CONNECTION: Bluetooth 3.0 technology provides a wireless connection, the external 34-keys full keypad extends your existing keyboard, operating distance 10m. NOTE: For Laptop Desktop PC without Bluetooth function, you need a Bluetooth adapter (not included) 2. HIGH-CAPACITY RECHARGEABLE BATTERY: Bluetooth number pad has a 160mAh lithium rechargeable battery. The Bluetooth numeric keypad is easily recharged through the USB cable. The Bluetooth 4wireless keypad also has the auto sleep function, lower power consumption, reflect energy saving and humanization of the product. Press any key can wake up the keypad within 3 seconds. 3. ALUMINUM DESIGN: Bluetooth number pad is constructed of solid and premium aluminum materials for long-lasting use, the ergonomic tilt for comfortable typing and good look, slim style appearance, perfectly matches your , Air / Pro, , PC, surface pro, laptop or desktop as the side external numeric keypad. 4. WIDELY COMPATIBLE: This Bluetooth wireless number pad it includes shortcut keys and low profile quiet scissor-switch keys Compatible with Windows, Android, , Pro, Air, , Surface Pro, Tablet PC Desktop laptop, etc. NOTE: The 10-key is NOT compatible with ChromeBook. And the "page up", "page down", "search", "screenshot" and "ins" key 't work with OS, but other keys and number keys work well colour: black Material: aluminum alloy Size: 14.6x11.4x0.9cm Package Contents: 1 x Bluetooth Numeric Keypad 1 x charging cable Only the above package content, other products are not included. Note: Light 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.