Here is a photo of an air switch kit.
We use these all the time in our kitchens. These “air powered” switches use a puff of air to turn on your garbage disposal.
The black box and hoses are mounted and plugged in, under your sink in the cabinet. All you see from the sink side is the chrome button of the switch. A hole is cut in the stone to allow this to be mounted next to the kitchen faucet.
With this air switch, you never have to touch your electrical appliance (disposal) and water at the same time. Neither do you have to put your hand into a sink full of greasy dirty water, using the batch feed handle some disposals come with.
These list for about $140.00 plus installation. We’ve used cheaper in the past, but this brand is the best we’ve used.