[ 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 for Android Windows 2000/ Me/ 98/ XP /Vista/ 7/ 8/10 system. NOTE: [This number pad is NOT completely compatible with for OS system and iOS system, Calculator Key and Functional Keys(home, end, , 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 comfortable 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) SPECIFICATION Number of Keys: 28 keys Switch:Scissor Switch Battery Required:140mAh lithium battery Colour:black Material:Aluminum alloy Size:121 x 100 x 12.5mm Package Contents: 1 * Numeric keyboard 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.