1. How many batteries needed?
The wireless keyboard works 1 AAA battery, the mouse uses 1 AA battery, and the batteries are not included.
2. What device system needed?
This white keyboard and mouse is compatible with Windows XP/Vista/7/8/10+, Mac OS 10.14 or above.
3. Where is the USB A/C receiver?
There is only ONE receiver, stored in the mouse, next to the mouses battery slot.
4. Why the keyboard cant be switched to OS system?
When use the USB C port, please push the USB C receiver fully into your mac. Otherwise, the keyboard and mouse cannot connect to your mac, and you will find that the keyboard cannot turn to OS system.
5. How to switch multimedia or F1-F12 functions?
The keyboard is in media functions by default. The F1-F12 functions need to be activated by pressing fn + F1-F12 keys. Or you can activate the fn lock to use the F1-F12 function directly (The fn lock key locates next to the F12 key).