RFID security tag, Resin material, EM4100 card , different color to choose RFID security key,Model: LK-EMS3,Card type: EM4100, ... ,blue, pink,green,orange ,red,yellow color avaiable .Use for swimming pool cabinet lock for master key, serivice key or guest key .These ... keys are water proof and moistureproof . RFID security keys use for EM card cabinet lock for swimming pool (LK-EMS3)