? SLIM 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 ( Only 0.46lb, 5.7*4.4*0.47 inch ) ? BLUETOOTH 3.0 CONNECTION: Bluetooth 3.0 technology provides a cable-free & clutter-free connection, the external 34-keys full keypad extends your existing keyboard, operating distance 10m. ? HIGH-CAPACITY RECHARGEABLE BATTERY: Built-in 160mAh lithium rechargeable battery. The Bluetooth numeric keypad is easily recharged through the included USB cable, no need to change the battery and user- friendly. The Bluetooth wireless keypad also has the auto sleep function, lower power consumption, reflect energy saving and humanization of the product. ? WIDELY COMPATIBLE: Compatible with Windows, Android, iMac, MacBook Pro, MacBook Air, MacBook, Surface Pro, Samsung Tablet PC Desktop laptop, etc.