This kit is a complete automatic watering starter kit. You can add more drippers or tubing to suit your requirements but even in standard form this system has the ability to water 20 containers. I use this for my raised beds and the battery powered timer system is very, very handy. No need to worry if you're going away for the weekend, the system takes care of all your essential watering.
I would recommend purchasing extra inline drippers as this will give you more scope, especially if you have a number of raised beds.