Check the listing for details. Pack of 3 125-kHz RFID Antennas with RS-232 Interface, 2 LEDs & Common Anode. Condition: New. Listed at 46.99 USD. This is a pack of 3 Drexia RS-H3-05 125-kHz RFID antennas. Free shipping to U.S. destinations from our U.S. warehouse! They offer contactless readout of identification data (UID) from transponders (cards, keyrings, etc.) compatible with ISO/IEC14443-3-A (for example, MIFARE CARDS). The built-in two-color LED and buzzer can be used in various products. Read out UID data is sent as a string of ASCII characters through the RS-232 TTL open collector interface.The data read from a transponder is transferred with RS-232 TTL interface. Standard transmission speed is 4800 bps.Mounted bicolor LED (red/green)Common anode. (Need common cathode? See this version: https://www.ebay.com/itm/332661552506) Designed to be mounted with glue. Low case.Standard cable length: 15.75 inches (40 cm), 5 wires.