Sony xb-20 bluetooth speaker, used.
I bought these last year for 60eur on a discount, and used always as a tv speaker so didn't move around much. No wear and tear whatsoever.
Great sound. Nice extra bass if u like. Good for vocals, speech, movie dialogues and clean music. Water splash resistant.
Battery lasts three days easily with my tv running ~4 hour daily, so at least 12 hours of battery life on full charge.
Comes with mobile app to switch the source between mobile and aux cables. Very handy.