This Dig BOHE-BT Bluetooth Timer is optional for use with the GreenStalk Spring Automatic Watering System. It includes several options for programming and is controllable from your smart phone.
Recommended timers from other GreenStalk Gardeners:
Melnor 65099-AMZ HydroLogic Digital Water Amazon Bundle, 1-Zone Timer & Moisture Sensor Set
Orbit 3-Outlet Hose Watering Timer
RAINPOINT Smart Water Timer for Garden Hose with Brass Inlet, Bluetooth Sprinkler Timer 2 Outlet, Smart Hose Timer with Rain Delay, APP Control, Automatic Irrigation System for Lawns and Yard
Orbit 2 Outlet, Programmable Digital Irrigation Watering Timer