Its a drip irrigation and possibly with a backflow inhibitor. It might have a fertilizer feeder, I don't see a timer, but that can be elsewhere.
I suggest you have an irrigation company come by to take a look at it. They my be able to see where the timer or control functions are and guess where the underground pipes are.
They might not even charge for the visit if they hope you want improvements or repairs.
And you might. If you have a slightly functional watering system, repairs might be worth exploring. Controlled watering can be very water-efficient.
