... .Color:blue, red, black, etc. 4.Fast delivery Waterproof silicon wristband with high quality from China IC Options of ... M4, etc.Specifications of RFID Wristband1) Material: silicone2) Dimensions: watch dial—oval; inside diameter--65mm; band width—20mm3) Color: ... ) Close-type watchband, elastic, easy to wear and use, waterproof, moisture proof, shockproof, and resistant to high temperature2) Working ...