... , moisture-proof , shock-proof and anti-High temperature RFID Wrist Band 1. Material: Silicone2. Out diameter: 58mm, 67mm, 75mm3. Waterproof , ... , shock-proof and anti-High temperature 4. Closed-loop wrist band , flexible , easy to wear and to use5. It's ... widely used in very humid environment, such as swimming pool , cooling library ,waterproof patrol , field operations, also can work properly ...