Crazefoto Portable Bluetooth Speaker with Expansion Casing Bundle - Warm Grey - Modular Extremely portable, smaller than a palm Powered by patented ORCHAS technology to give hi-fidelity audio with excellent clarity, with the ability to enhance audio quality further through the use of the expansion casing Impressive battery life, with Bluetooth playback lasting up to 20 hours Award winning design that stands out from conventional speakers Modular, allowing multiple speakers to be combined with other expansion casings, like UB+ Eupho Brave and UB+ Eupho Stereo, to form larger speakers