Original Sony Ericsson Active Speaker MAS-100 - Urban Silver. Go on, get out there! With the MAS-100 you can carry and protect your phone and listen to the music on it in one great device. Grab it, take it and share your music outdoors. Connect your phone inside the MAS-100, zip it up and listen to music on it through the speaker. Use any Sony Ericsson music phone you want. Designed for those who love working, playing or relaxing outside. And who love music. Its sporty looks and design enable you to strap it to your bag or bike.