An Enacfire Bluetooth speaker.
Have a few different ones in the house for barbecues/picnics etc... Including some pricey Anker ones.
This thing sounds great (not compared to proper hifi separates of course), it has fantastic battery life and is robust with great build quality.
I got it on sale for €22 and it blows an Anker model away which was over twice that price.
Solid bass, decent mids and very little distortion if transmitting from a modern smartphone. I tested it with a wide range of music, from Barber/Iron Maiden/Basshunter and Connie Francis
It's a great little unit.