Omron V700 series Operation Manual page 3

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Precautions of Use
This Product uses a frequency of 125 kHz to communicate with a tag. Some transceivers,
motors, monitor units, and power supply (power IC) emit noise that adversely affects this
communication with the tag. If this product is to be used in an environment close to such
devices, please check the effects from these devices prior to use.
To minimise the effect of noise, please ground any metal object surrounding this product.