No luck with the first shipment volume controls were not working. But back on the same day at the expense of Amazon, and soon received a new fully functional device. Chosen model compared to others because the speakers are protected. The sound is relatively strong in relation to the dimensions of the device, it is not clear if the volume grows too. Only drawback, but I suspected, it reads (on top) that USB key MP3 file, not the other formats. Also everything seems stuck, so will it be possible to replace the internal battery? By then it will just be better to buy a new device.