The Rachio Smart Hose Timer is a more effective and easy-to-use alternative to traditional clock hose timers. Easily create schedules using multiple valves in the Rachio App. Let it water while you're away and send notifications if rain skips or other changes occur. Smart Hose Timer valves require two AA batteries (not included) and a WiFi Hub. Each WiFi Hub can manage eight valves. Note: This device only works with 2.4 GHz WiFi network.