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This product is a 125KHz RFID swipe decoding module, and integrates the antenna in the PCB. The J1 port and the J2 port have an opposite level, but the port is an open-drain output, and the corresponding level can be output through a pull-up resistor.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.