... quality!HUA 125khz RFID keys HUA-CP1Electronic chip sealed in the PVC case,waterproof and shock-resist,easy to install, ... completely waterproof, and can be sealed inside non-metallic material walls; Button, circle, keyring, nail and cylinder-shaped cards ... incidents. Its working frequency is 125KHz..track metal parts, components in chemical baths, injected molded plastics, palettes, or containers, ...