Solaar will detect all devices paired with your Unifying Receiver, and at the very least display some basic information about them.

For some devices, extra settings (usually not available through the standard Linux system configuration) are supported:

The [K750 Solar Keyboard][K750] is also queried for its solar charge status. Pressing the Solar key on the keyboard will pop-up the application window and display the current lighting value (Lux) as reported by the keyboard, similar to Logitech's Solar.app for Windows.
The state of the FN key can be toggled on some keyboards ([K750][K750], [K800][K800] and [K360][K360]). It changes the way the function keys (F1..F12) work, i.e. whether holding FN while pressing the function keys will generate the standard Fx keycodes or the special function (yellow icons) keycodes.
The DPI can be changed on the [Performance MX Mouse][P_MX].
Smooth scrolling (higher sensitivity on vertical scrolling with the wheel) can be toggled on the [M705 Marathon Mouse][M705] and [Anywhere MX Mouse][A_MX].

Supported devices

Keyboards:

Device	Battery	Other features
K230
K270
K350
K360
K400 Touch
K750 Solar	yes	FN swap, Lux reading, solar button
K800 Illuminated	yes	FN swap

Mice:

Trackballs:

Device	Battery	DPI	Other features
M570 Trackball

Touchpads:

Device	Battery	DPI	Other features
T650 Touchpad

Mouse-Keyboard combos:

Device	Battery	Other features
MK330
MK710		FN swap