Card reader auxiliary device and working method thereof

A method of operation of a card reader auxiliary device, the card reader auxiliary device depending on a card reader, comprising:

• step S1, detecting, by the card reader auxiliary device, whether a card exists based on contactless field of the card reader, activating a timer when detecting that the card exists, and opening contactless field of the card reader auxiliary device;
• step S2, obtaining, by the card reader auxiliary device, a current time of the timer, determining whether the current time is more than a first preset time, if yes, executing step S3;
• otherwise, going back to execute step S2;
• and
• step S3, closing, by the card reader auxiliary device, the contactless field of the card reader auxiliary device.

A card reader auxiliary device, comprising:

• a detector configured to detect whether a card exists based on contactless field of a card reader;
• and
• a processor configured to activate a timer in case that the detector detects that the card exists, and open contactless field of the card reader auxiliary device;
• wherein the processor is further configured to obtain a time of the timer, and determine whether the time of the timer is more than a first preset time;
• and
• the processor is further configured to close the contactless field of the card reader auxiliary device when determining that the time of the timer is more than the first preset time.