... -16mm 3.Color: blue, red, black, etc. Waterproof rfid wristband made of silicone material IC Options of RFID Wristband1) LF ... M4, etc.Specifications of RFID Wristband1) Material: silicone2) Dimensions: watch dial—oval; inside diameter--74mm; band width—16mm3) Color: ... Close-type watchband, elastic, easy to wear and use, waterproof, moisture proof, shockproof, and resistant to high temperature2) Working ...