Using a radio signal removes the risk of false alarms. All wireless key finders have to "listen" for a searching transmission, resulting in battery replacement at intervals ranging from 3 months to a year. A separate transmitter is used to activate one or more receivers. Because of this low quality and unreliability, these early key finders were soon discarded and were unpopular for serious needs.Īs electronics became smaller and cheaper, and battery life improved, radio became viable to locate the keys, which were fitted with a small receiver. Determining what was a clap or a whistle proved difficult, resulting in poor performance and false alarms. Early models of key finder were sound-based, and listened for a clap or whistle (or a sequence of same), then beeped for the user to find them.
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