any power source, makes them ideal for the on-the-go guy or gal. Finally, one less battery pack or power cord to carry around! Bone Collection Horn Stand We love the amount of sound amplification it provides. Looking like an old school gramophone, it gives your smartphone a little boost in the sound department. For $25 you will get the rubbery feel and bright colors. You can place it horizontally or vertically, however you may like it most. It has the ability of being able to still connect your cable. It can increase the original sound of your device by up to 13 decibels. Clingo Parabolic Sound Sphere Looking more like a bubble chair from Aarnio Eero, it gets the job done. Not only does it looks good but has a friendly, chic design. Available at $35, the unit was a little bit on the softer side. Music sounded a little bit muffled. This is the typical case of great design over function. Griffin AirCurve Play In terms of sound quality, this was the best of the bunch. $20 will get you this clear coiled wave looking horn, enclosed inside a rectangular shape. Griffin claimed to add 10 decibels to your tunes, but lab tests provided consistent 14 decibels each time. This is a great example of compromise between form and function. Matt Richmond brings the iPhone Horn. New technology married to a very old school Magnavox gramophone horn. Zero electronic stuff in here, just pure sound amplification.