SLIM ALUMINUM DESIGN: Bluetooth number pad is made from strong and premium aluminum materials for durable use, ergonomic tilt for comfortable typing and beautiful appearance, slim style appearance (only 0.46lb, 5.7*4.4*0.47 inch BLUETOOTH 3.0 CONNECTION: Bluetooth 3.0 technology provides a wireless, cable-free connection;Clutter-free connection, external 34-key full keyboard extends your existing keyboard, 10m operating distance.【NOTE: For desktop laptops without Bluetooth function, you need to use a third-party Bluetooth adapter (not included) before use】 HIGH-CAPACITY RECHARGEABLE BATTERY: Built-in 160mAh rechargeable lithium battery.The Bluetooth numeric keypad is easily recharged via the included USB cable, no need to change the battery and user-friendly.The Bluetooth wireless keyboard also has the automatic sleep function, lower power consumption, reflects the energy saving and humanization of the product.Press any key to wake up the keyboard in 3 seconds. WIDELY COMPATIBLE: This Bluetooth wireless number pad features low-profile, quiet shortcut keys and scissor switch keys so you can work comfortably on your computer or laptop. Compatible with Windows, Android, iMac, MacBook Pro, MacBook Air, MacBook, Surface Pro, Laptop Desktop Tablet PC, etc.【NOTE: Key 10 is NOT compatible with ChromeBook.And the page up, page down, search, screenshot and ins keys will not work with Mac OS, but other keys and number keys work well】