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Invisible Fence Inc. (commonly referred to as Invisible Fence Brand) is a company that designs radio pet fences for cats and dogs. Manufactured and distributed by Radio System Corporation, the company sells wireless and fenceless systems that were first introduced in 1973. [ 1 ]
Nofence is a Norwegian company that makes GPS collars for farm animals (cattle, sheep, and goats) that discourage them from crossing virtual fences. [1] [2] Oscar Hovde Berntsen has been working on the idea of virtual fencing, as an alternative to fixed electric fencing, since the 1990s. [3] Nofence was incorporated in 2011. [3]
An underground fence is an electronic system to prevent pets from leaving a yard. A buried wire around the containment area emits a radio signal to activate the receiver collar. A shock collar on the pet receives these signals. When the pet approaches the buried fence line, the collar makes a warning sound and then gives the pet a harmless ...
The collar emits a warning noise near the wire, but if this is ignored, produces a mild shock. Humans and other animals are unaware of the buried line. In a similar system, the collar uses GPS signals to determine proximity to a predetermined "virtual fence" without a physical installation.
A typical shock collar. Shock collar used on a riot police dog in 2004 in Würzburg.Two years later, [1] Germany banned the use of shock collars, even by police. [2]A shock collar or remote training collar, also known as an e-collar, Ecollar, or electronic collar, is a type of training collar that delivers shocks to the neck of a dog [3] to change behavior.
The system uses battery-powered collars that emit a sound to warn cattle when they are approaching a virtual boundary. If a cow wanders too near, the collar emits a warning noise. If it continues, the cow gets an electric shock of 250-milliwatts . The boundaries are drawn by GPS and exist only as a line on a computer.
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