but technically, they are automated guided vehicles or agvs. >> what they do is they deliver food, supplies, clothing, linen to the housing units here at santa rita jail. we're a half mile fence to fence, so it would take a lot of inmates, a lot of the inmate labor, deputies to supervise is the inmates to transport those items to the units so these robots do it for us. we're the only facility i know that actually has this kind of a system. it runs is 24 hours a day, seven days a week. >> the agvs utilize a wire guided navigation system which is built into two miles of track running between all the jail's housing units and service areas. the series of sensors and infra red signals guides them to precise locations where carts are waiting transfer to or from the units. once in position beneath the cart, the agv gently lifts it off the ground and takes it away. they are powered by nickel cadmium batteries.