Samsung reveals robot sentry set to keep an eye on North Korea

South Korean forces have installed a team of robots along the border with North Korea. The machine-gun wielding robots, built by a subsidiary of Samsung, have heat and motion detectors to identify potential targets more than 2 miles away. The SGR-1 has a 5.5mm machine gun and a 40mm grenade launcher - although needs a human operator to give it the go ahead to fire.

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