Ultra-portable JBL Pro Sound . The JBL Go 4 packs a serious musical punch, delivering big JBL Pro Sound with punchy bass. Your friends won’t believe how much great JBL Pro Sound comes out of such a small speaker. p to 7 hours of playtime plus 2 hours with Playtime Boost JBL Go 4 gives you up to 7 hours of playtime on a single charge. Simply tap Playtime Boost to prolong the playtime, adding up to 2 hours to your battery life. It tunes and optimizes the performance for louder and crisper sound. Waterproof and dustproof: The JBL Go 4’s IP67 waterproof and dustproof rating ensures this portable speaker can handle almost any environment, from a poolside party to a seaside picnic. Multi-speaker connection by Auracast : Want even bigger JBL Pro Sound? Pair two Go4s for stereo sound, or wirelessly connect multiple JBL Auracast-enabled speakers using Auracast for even bigger sound. JBL Portable app Use the JBL Portable app to receive updates, get product support, and unlock features, all straight from your phone. Fine-tune your sound with multiple EQ presets options. Or use the fully customizable equalizer to adjust highs, mids, and lows—so your music is just right for you