drive thru

if I was purchasing a building that USED to have a drive thru, but the electrical components have been pulled, does anyone know where I would get the speaker and headset for a new drive thru. and how much a unit would cost

Here are some to look at…,,, and When I was looking, I pretty much settled on the hme digital system and that ran about $3,000 to start, but my drive thru pickup window got shot down at a public hearing so I never bought. Good luck!