We love our iPhones, but we have to be honest: their speakers are pretty weak. The Amp iPhone Speaker Case aims to fix that, and in a big way. Instead of just boosting the sound coming out, the Amp uses advanced algorithms to deliver personalized audio, based on your hearing pattern, musical preferences, and your surrounding environment. Features include an ARM M4 processor, 24-bit digital-to-analog converter, and a built-in battery that provides up to 7 hours of playback through the powerful 14x20 mm drivers or 20 hours of playback through the built-in headphone amplifier, while also boosting your battery life by over 25%. Available for the iPhone 5, 5S, 6, and 6 Plus.