The TIAO Smart Sprinkler (Amazon ASIN code: B0158DTQ9O) comes with 16 stations. However if your system has more than 16 zones, then you need expansion boards.

Each expansion board has 16 stations, so if you are 32 stations, you need a TIAO Smart Sprinkler Controller and an expansion board.

This expansion board is compatible with Open Sprinkler Controller.

However this expansion board is NOT compatible with TIAO Smart Sprinkler Pi V1 or V2.

You will receive once piece of the TIAO Smart Sprinkler 16 Station Expansion Board and a connection cable.

• Add 16 more zones to your sprinkler system
• Compatible with TIAO Smart Sprinkler Controller and Open Sprinkler Controller

Add 16 more zones to your sprinkler systemTIAO CORP.