... -16mm 3.Color: blue, red, black, etc. Waterproof rfid wristband made of silicone material IC Options of RFID Wristband1) LF (125KHz): EM4100,EM4200,T5577 ... Wristband1) Close-type watchband, elastic, easy to wear and use, waterproof, moisture proof, shockproof, and resistant to high temperature2) Working temperature: -50°C ...