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The Wave Ceptor series is a line of radio-controlled watches by Casio. Wave Ceptor watches synchronise with radio time signals broadcast by various government time services around the world. These signals transmit the time measured by atomic clocks accurate to one second in millions of years. By synchronizing daily with the signals, the Wave Ceptor watches achieve high accuracy, using a quartz crystal to keep time between synchronizations. Some radio watches, including some Wave Ceptors, are solar-powered, supported by a rechargeable battery. The display of the models ranges from fully digital, analog and analog-digital. Some later models, described as Hybrid Wave Ceptors, support GPS for information on both time and location, in addition to broadcast signals.
Radio-controlled watches require no setting of time, date, or daylight saving time adjustments, as they attempt automatic synchronization several times every night. Without synchronisation, Wave Ceptors, like other commercial quartz timepieces, are typically accurate to ± 15 seconds per month; daily synchronization ensures 500 ms accuracy.
Most Wave Ceptor watches have a signal strength indicator which shows if the time signal is strong enough to correct the time set. The number of transmitters which the watches can tune to vary according to watch model; most current watches can tune to any one of several time signal broadcasts around the world. In Europe, the claimed reception range is approximately 1,500 kilometres.