This document discusses a proposed music streaming device that would allow users to download high-quality personalized music selections over WiFi to cache and listen to offline on their mobile devices. It would monitor listening habits to provide personalized recommendations without using monthly phone data. The device would connect to phones or headphones and be accessed via an app for Apple and Android devices for a monthly or yearly fee. User personas are identified that would benefit from such a device, including a student who wants to discover new music without going over her data limit and a commuter who has no service on subways and finds purchasing music online too expensive.