... HUA 125khz RFID keys HUA-CP1Electronic chip sealed in the PVC case,waterproof and shock-resist,easy ... to withstand intentional sabotages, which can operated in wide temperature ranges.They are also completely waterproof ... Its working frequency is 125KHz..track metal parts, components in chemical baths, injected molded plastics, palettes, or ... Mirefare RFID Tags/bury labels installed in the wall