We currently only have an OSBee Shield for Arduino. Within the US, 24 VAC valves are still pretty standard and common to find, so the 24 VAC version of OpenSprinkler will still be our main product. DC latching solenoids (which is what OSBee is designed for) are most suited in battery-powered controllers. But because our focus is on web-based controllers, which are pretty power hungry, they have to be powered from a wall adapter and batteries won’t be sufficient. This defeats the purpose of choosing latching solenoid valves. So unless if you can’t source 24 VAC valves (which may be the case for International markets), there is no strong reason to use latching solenoid valves.