The light source can be your indoor lamp's light or day light. No need to take it out to the sun to get it powered.
The keyboard is very thin (one-third inch) and gives a feel good typing.
It comes with a tiny Unifying receiver which stays in your laptop or PC. You can easily add a compatible mouse and won't need any additional receiver.
The Solar App software will indicate the charge level and the amount of light available to the keyboard.