Vintage, revival and old style don't go out of fashion only for jeans and clothing.
Audio culture and amplification come from old gramophones and cd player, and even if today there are millions of models of speakers/amplifier, the charm of the dear old "sound horn" is still alive in our hearts to recreate (smartphone version for Iphone/samsung and all the others) a special one which relives the old times. With a plastic or silicon body, it is available in different designs and customizable in size, colors and printing. Using the old science of sound propagation it adds 12 decibels of output power to yuor speaker, and thanks to its ergonomic shape, it doesn't need power or energy.
In short....... more power, more volume, no waste of battery!