Cateck numeric number keypad bluetooth with 22 numeric keys Humanized DesignErgonomic design, thin and compact keypad in a laptop bag or briefcase to efficiently enter data wherever you go.Number Pad with 22 KeysThis wireless keyboard has 22-keys with multiple useful shortcuts including NUMLOCK, ESC,Del, End, Tab, Home, Page up/down, bonus symbols keys and calculator export button, etc. Meet all you need of a number keyboard.LED Light Display Status-Bluetooth connection: Please turn on the power at the bottom of the keyboard, red lights up 3s, press the TBA Bluetooth connection button 3s, green light will winkle and into the match mode quickly.- Low voltage status: when the working voltage below 0.9V, the red indicator light blinks.-Numlock: greenIn order to prolong the life span of the battery, when you do not use the keyboard for a long time, please switch off the power.How To Connect?1.Insert one AAA batteries and switch to ON position from the back of the keypad.2.Long press Bluetooth key with 3 Seconds until the LED1 shows red flicker.3.Find setting in your device, and turn on Bluetooth function in your device.4.Find and select "Bluetooth Keyboard" from the list and click to pair.5. When Bluetooth setup assistant page shows the "Bluetooth keypad" being connected successfully, you can type numbers into Excel Sheet by this keypad to see whether it is really successful.Compatibility- Mac OS X 10.6 & higher- Windows 98SE /ME /2000 /XP /Vista /7/8 /10- Linux 2.4 or above Note - "? ? ? ?" , Home, End, Ins, Del, PgUp and PgDn buttons work with Windows XP/Vista/7/8/10, however NOT with Mac O.S.-The "Num Lock" button works with Windows XP/Vista/7/8/10, however NOT with Mac O.S.