So I understand it is a little confusing. But each hose faucet timer is 1 zone, since it waters just one line. all of your hose faucet timers need to be programmed and paired individually. To do so you have to switch between them as your active device to be able to edit and/or add a program. It says zones because the app is the same for out underground sprinkler timers. Which have multiple zones or lines connected to them.