The device plays only through one speaker (left). The one located on the right side doesn't do anything. As a consequence the device is quiet and lacks stereo. BT connection works well. The trouble might be caused by transportation let's say but there is no damage visible on the device.
The device started to fully work without me doing any repairs the other day. Kind of amazing. So everything is fine now, sounds much better now with both speakers playing.
Good product at the price. Did not have original packing, but still satisfied.