"The Willen speaker lets you take Marshall's iconic design and sound quality anywhere. Its 2"" full range driver pumps out full and clear sound, so your music will sound amazing. A single charge will give you up to 15 hours of battery life - that's quite the party. And if there's a music emergency, you can get up to 3 hours from just 20 minutes of charging. The IP67 dust and water resistance means that not even rain can stop the fun. Good to know - Control your music with the multi-directional control knob on the front - Stack mode lets you connect several Willens together when one is just not enough - Use the speaker to make calls thanks to the built-in microphone - You can mount it almost anywhere using the flexible strap on the back - The Marshall Bluetooth app lets you control the speaker and set your own EQ"