Resistant design shock and to immersions 1 meter deep will indeed allow you to take this BRV-Pro speaker during a picnic and why on a construction site.
The connection with the device will be made by Bluetooth, which will allow you to connect the smartphone which will remain in your pocket or come to take shelter in the storage provided for this purpose (see second photo), while the power supply will pass through a 2,220 mAh battery which will allow you to consider up to 'at 20 hours of listening.
But that's not all since optional modules will increase autonomy and add other functions. We can cite the solar panel to take advantage of a long exposure to the sun, the additional 2800 mAh battery, the Qi module to charge the smartphone wirelessly or the LED panel to take advantage of a lighting source.
Braven BRV-Pro audio device (click to enlarge)
The availability of this Braven BRV-Pro speaker is announced for the second trimester of the year. Count $ 149.99 for the base speaker. Options are billed between $ 29.99 and $ 49.99.