Proximity tag for contactless readers of locking systems Keyless opening convenience for locking systems with proximity reading unit, such as ABUS security fitting SLT-LCA-AFP or ABUS CodeLoxx CLX-LA-AFP. The proximity tag can be carried on a key ring and enables contactless opening and closing. The RFID key fob is equipped with an EM4200 chip and has a strong security feature thanks to an individual numbering.