MARSHALL SIGNATURE SOUND: Features balanced Marshall signature sound and harder hitting bass, Willen II punches above its size in more ways than one. 17+ HOURS OF PORTABLE PLAYTIME: Offers 17+ hours of portable playtime on a single charge, so you can keep listening and never run out of steam. DUST AND WATERPROOF: Has an IP67 dust and waterproof rating so you can submerge it in 1 m (3 ft) of water for up to 30 minutes. This is a speaker that won’t let rain or dirt get in the way of your music. FASTENING STRAP: The ultimate multi-purpose speaker. Stand it up, lay it down, fix it to an object or let it hang thanks to its rubber fastening strap. BUILT-IN MICROPHONE: Comes with a built-in microphone, so that you can take calls completely hands-free.