... stainless steel body,great concealed,waterproof,Working life up to 20 yearsHUA-90BType:1990A-TMPhysical:Electronic chip stored in ... water-resistant.strong & durable.Used as patrolman identification.1. Ideal for Security Personnel, monitoring Factories, Offices, Hotels, Car parks, Shopping ... issue, Inventory, Asset tracking etc... Various file tracking ibutton with keyfobs for automotive application