I bought Logitech MK360 combo in Costco store. It is less than $30.
Includes three items:
Logitech K360 wireless Keyboard
Logitech M215 wireless Mouse
Logitech Unifying USB receiver
Here are some pictures I took.
Opened the box and see the items inside. Left is the keyboard, right up is the mouse, right low is the USB receiver.
Took the keyboard out and rip the plastic cover. Looked at the back of the keyboard. It is K360.
Then, the mouse is M215, and Unifying USB receiver.
Logitech K360 Keyboard
Compact size Keyboard
Three-year battery life
6 Hot-Key and 12 Programing key
Logitech Unifying USB Receiver
One tiny receiver for up to six Unifying devices. Plug it and leave it, then connect additional mice and keyboards to one computer.
I used them for one week now. They are small or compact, but very functional and reliable.