He does his job well, good power for the size of the object. It includes a useful USB Charge the small built-in battery and a jack for connecting to the device. After loading, the enclosure is used without USB for 1 to 2 hours depending on the desired power.
The sound is okay, is not his job but wonders. Do not push down, it sizzles.
A good buy for a handful of euros, troubleshooting.