Blind person here. This is a lot easier to do if your device requires you to firmly press on the surface to activate the controls. If it doesn't, you will inevitably activate something while trying to feel around for the label. There are ways around this, either a maze of long, thin seals that goes between the buttons and that you can move your fingers over, or a cardboard overlay with somewhat deep holes, but those devices are a lot more annoying.
It's even worse when the device remembers its last state, and going pass the last option cycles back to the first. If this happens, there's no way to reliably set the temperature for example, as you don't know the current value and have no way of setting the device to a predictable state.
It's even worse when the device remembers its last state, and going pass the last option cycles back to the first. If this happens, there's no way to reliably set the temperature for example, as you don't know the current value and have no way of setting the device to a predictable state.