Antarmuka Z-Alert (sumber: https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwi52-rTntrSAhXCI5QKHahFDMgQjRwIBw&url=https%3A%2F%2Fitunes.apple.com%2Fke%2Fapp%2Fz-alert%2Fid1184182866%3Fmt%3D8&psig=AFQjCNFPVw5NpdfzPYxqBFaRaWa4CiPWmw&ust=1489724752081443)
