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Very good device readers, transponders have a wireless transmission function, frequency and modulation freely chosen. Not allowed to use the existing radio frequency identification cards or used to identify a dedicated chip. Coil coupling device for hollow circular coil with a diameter of not more than 1mm of wire or wire insulation jacket 10 around the circle made of Micronesia. Coil diameter of 6.6 ± 0.5 cm (about 6.6 cm in diameter can be used the cans as the skeleton around the well off, can be fixed with insulating tape). Medium between the coil for air. The nearest part of the two coupled coils is defined as the distance D. Readers, transponder coupling should not be used in other ways
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