2.4GHz Mini USB Wireless Numeric Keypad 19 Keys Number Pad Numpad

how to pair if I buy Bluetooth keyboard?

Pair code:"Enter"+"NumLock"

How to switch operation system:

"Enter" + "/" =windows (default)

"Enter" + "*" = android

"Enter" + "-" = ios

What's in the box:

1, Bluetooth-compatible Keyboard:
Bluetooth Keyboard*1 (do not have and no need any receiver, just your computer have Bluetooth function, it can work perfectly)

2, 2.4G Wireless Keyboard:
keyboard+mini receiver

3, Wired Keyboard:
cable keyboard*1