MIGHTY SOUND, EVERYWHERE, 15+ HOURS OF PORTABLE PLAYTIME, one 2’’ full range driver and two passive radiators, mighty portable speaker, Willen comes with a top-of-class IP67 dust- and water-resistance rating so it’s always ready for the road, 3 hours of charging will bring it back to full power, Attach Willen Anywhere with the strap, Built - In Microphone, Answer and reject calls using the front-mounted control knob and enjoy some hands-free chat. Connect More Speaker with Stack Mode, Stack Mode raises the stakes with a sound larger than Willen. Amplify your sound with a multi-speaker session by connecting your speaker to other Willen speakers. Create a sound as big as your imagination, Quick Charging, 20 minutes charge gives 3 hours of playtime