Product Size: 4-3/8" W x 2" H

This amazing portable silicone mini megaphone speaker amplifies the sound from your iPhone by up to 15 dbs; sounds like 2 to 3 times as loud without any batteries. It uses old fashioned horn or megaphone technology. Holds iPhone vertically, horizontally, and has opening reserved for charger. It also works well in hands free mode. It works only with iPhone 5, 4S, 4G, 3S and 3G phones. Perfect for organizations, schools, sport teams, businesses, charity fund raisers and individuals to raise funds and advertise products in a fashionable way. Also great for trade shows, health awareness campaigns, conferences, outdoor, sporting events, and more!