Quad Proof Tough - super-rugged shell for temperature, dust/dirt/sand, splash and shock-proof protection. * Powerful Outdoor Sound. Ultra-Compact Design * Wireless Audio Streaming and Speakerphone via easy sync with Smartphones for hands-free use. * Long-Lasting Power - up to 8 hours of music playback with rechargeable battery. * Panasonic Music Streaming App is available.