The Stockwell III isn't just another portable speaker — it doubles the battery life from 20 to over 40 hours while adding True Stereophonic for 360° audio and a dynamic loudness algorithm that keeps bass/mid/treble balanced at any volume (boosting lows and highs at lower volumes). It looks like a guitar amp with brass controls, has a PU leather strap lined with velvet, an IP55 rating, and replaceable components including the battery, grille, and sleeve. Now in two colors from Marshall; hits big box retailers August 4.

Source: https://www.engadget.com/2190716/marshalls-stockwell-iii-portable-speaker-offers-more-than-40-hours-of-use-per-charge/