[ Aluminum alloy ] - The product is made of high quality aluminum alloy material, which is beautiful and hand feels is good.[ Full-sized 28-key with Numlock, Delete, Tab & More ] - Use the wireless keypad with 28 function keys including backspace, home, end, tab and more to assist in accounting tasks, excel spreadsheets, and more to expand your existing keyboard.[ Compatibility ] - Widely Compatible with Cellphone Tablet PC laptop Desktop with compatible with Android Windows 2000/ Me/ 98/ XP /Vista/ 7/ 8/10 system. NOTE: [This number pad is NOT completely compatible with compatible with Macbook OS system and Apple iOS system, Calculator Key and Functional Keys(home, end, Pgup, PgDn and arrows) can not work but other number and symbol keys including ESC, Tab work well.[ Bluetooth & Wired Dual Mode ] - Bluetooth 3.0 technology provides a cable-free & clutter-free connection, operating distance 10m. but it also support Wired connection[ Advanced Scissor Switch ] - This Scissor-Switch keyboard provides you with very comcompatible withtable and pleasing typing experience.[ N970 with USB3.0 HUB ] - In addition to being used as a numeric keypad, it can also be used as a HUB. The two expansion interfaces are USB3.0, which transmits 5Gbps per second and is compatible with a variety of devices. ( N960 no USB HUB)SPECIFICATIONNumber of Keys: 28 keysSwitch:Scissor SwitchBattery Required:140mAh lithium batteryColour:SilverMaterial:Aluminum alloySize:121 x 100 x 12.5mmPackage Contents:1 * Numeric keyboardOnly the above package content, other products are not included.Note: Light shooting 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.