DIG, B09D 3/4” Single Outlet Hose End Programmable Timer for Home Gardens and patios

Can I position this in the garden and run a hose to it, or does it have to be installed at the spigot?

what is the minimum operating water pressure? will this work on a gravity-fed system (rain barrel)?

Can this timer be set to run for 12 hours continuously in auto mode. Example 8pm. To 8am. Every day???

Where is this product made? USA or where?