... concealed,waterproof 5 years warranty,one year free exchange for quality!HUA Contact Button HUA-90AType:1990A-TM Button, ... ,water-resistant.strong & durable.Used as patrolman identification.1. Ideal for Security Personnel, monitoring Factories, Offices, Hotels, Car parks, Shopping ... Goods issue, Inventory, Asset tracking etc... Various file tracking ibutton with keyfobs for automotive application