Treadmill for light use

[oblio]

My wife has some complex medical issues but does like to get out and about for a walk when she can. In winter this becomes more difficult so we are thinking of getting a treadmill so she can exercise indoors.

We are after a treadmill which will only be used for walking (not running) but would like one with the option to tilt the deck to make it more challenging. A rail around it would be useful as would an emergency switch (the kind that attaches to the person and stops the machine if they fall off/get into difficulty)

We also don't want to break the bank either

Can anyone recommend one?

Thanks