got a solar panel on the back here, which charges the battery. they are nice and lightweight and flexible so the cows have plenty of room to move around, and then there is a gps locator are the top there, so we can see exactly where the cows are at any one time, and that links to the virtual fence, which is up behind us, but wherever we want it to be, really. the collars mean the national trust can map out an area they want grazed on a mobile phone app. if a cow then approaches the invisible boundary, it first hears several music alerts, and if it doesn t turn back, instead trying to cross the virtual fence, the cow gets a mild electric shock. all this tech ensures the whole of this beautiful limestone landscape is kept grazed. they can be quite picky, they will choose the best grass that they want to eat, and sometimes what we want is for them to get into the scrub, some of the less delicious stuff, trample it down and create more sunlight for those species rich small plants that live
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