It is non-toxic, non-cracking, long-lasting, and non-irritating to the skin because it is made of silicone. Closed-loop wristband, vivid hue, pleasant texture, and ease of wear MHz: 13.56; Fudan chip High temperature resistance, shock resistance, moisture resistance, and waterproofness extensively utilized in field operations, swimming pools, bathing facilities, water parks, cooling warehouses, and waterproof inspections, among other places.