<P> Garage and gate remote control are very common, especially in some countries such as the US, Australia, and the UK, where garage doors, gates and barriers are widely used . Such a remote is very simple by design, usually only one button, and some with more buttons to control several gates from one control . Such remotes can be divided into two categories by the encoder type used: fixed code and rolling code . If you find dip - switches in the remote, it is likely to be fixed code, an older technology which was widely used . However, fixed code has been criticized for its (lack of) security, thus rolling code has been more and more widely used in later installations . </P> <P> Remote controls in military usage employ jamming and countermeasures against jamming . Jammers are used to disable or sabotage the enemy's use of remote controls . The distances for military remote controls also tend to be much longer, up to intercontinental distance satellite linked remote controls used by the U.S. for their unmanned airplanes (drones) in Afghanistan, Iraq and Pakistan . Remote controls are used by insurgents in Iraq and Afghanistan to attack coalition and government troops with roadside improvised explosive devices, and terrorists in Iraq are reported in the media to use modified TV remote controls to detonate bombs . </P> <P> In World War I, the Imperial German Navy employed FL - boats (Fernlenkboote) against coastal shipping . These were driven by internal combustion engines, and controlled remotely from a shore station through several miles of wire wound on a spool on the boat . An aircraft was used to signal directions to the shore station . EMBs carried a high explosive charge in the bow and traveled at speeds of thirty knots . The Soviet Red Army used remotely controlled teletanks during the 1930s in the Winter War against Finland and the early stages of World War II . A teletank is controlled by radio from a control tank at a distance of 500 to 1,500 meters, the two constituting a telemechanical group . The Red Army fielded at least two teletank battalions at the beginning of the Great Patriotic War . There were also remotely controlled cutters and experimental remotely controlled planes in the Red Army . </P> <P> Remote control technology is also used in space travel, for instance the Soviet Lunokhod vehicles were remote - controlled from the ground . Many space exploration rovers can be remotely controlled, though vast distance to a vehicle results in a long time delay between transmission and receipt of a command . </P>

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