TDK T79228 A34 Trek Max Wireless Bluetooth Speaker Portable with dust splash-proof IP64 - Black (Electronics)
The battery speaker TDK sounds good (but you should make its own EQ setting, Flat-EQ sounds a bit bland), makes for such a small box neatly volume and makes a solid and well-made impression. Actually, I'm a big fan of JBL, but TDK here prevails clear