Kind Notice for compability  - Widely Compatible with Cellphone Tablet PC laptop Desktop with Android Windows 2000/ Me/ 98/ XP /Vista/ 7/ 8/10 system. NOTE: [This number pad is NOT completely 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.  Kind Notice for USB Cable  The USB cable in the box is only for Charging. The keyboard Only can be used in Bluetooth Mode. It couldnt work properly under wired mode.    TWO COLORS ARE AVAILABLE  Silvery and Gray       SMALL ENOUGH TO CARRY AROUND  Key: 28 keys Battery: 140mah Size: 121*100*12.5mm Weight: 95g       ONE-CLICK CONNECTION       CLEAR STATUS INDICATOR  Bluetooth pairing indicator       BUILT-IN RECHARGEABLE BATTERY FOR LONG-TIME USAGE  Stadby time: ＞2 months Full charging time: 2 hours       FOUR ANTI-SLIP PADS       X-SCISSORS DESIGN  Mute&comfortable feeling for typing 3-5 millions times strokes       ANDORID/WINDOWS DEVICE COMPATIBLE       BOX CONTENTS  Usb cable+user manual+bluetooth keypad