cows on quick peek, controlled by the colours around their necks. ., .., , by the colours around their necks. ., .. , ., by the colours around their necks. ., , ., ., necks. you can see we ve got a solar panel necks. you can see we ve got a solar panel on necks. you can see we ve got a solar panel on the necks. you can see we ve got a solar panel on the back - necks. you can see we ve got a solar panel on the back which l solar panel on the back which charges the battery. they are nice and lightweight and flexible so the cows have plenty of room to move, and there is a gps locator on the top so we can see exactly where they are at any time, and that links to the virtual sense art behind us, which can be wherever we wanted to be. the national trust wherever we wanted to be. 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 appears several music alerts, and if it doesn t turned back, instead