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