The JBL Go 4 ultra-portable Bluetooth speaker fits in the palm of your hand, delivering clear, loud JBL Pro Sound with rich, punchy bass. It's waterproof and dustproof, so it loves to go outside. Ultra-portable JBL Pro Sound with punchier bass Don't let its little size fool you. 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. Up to 7 hours of playtime plus 2 hours with Playtime Boost Don't sweat the small stuff like charging your battery. 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. Multi-speaker connection by Auracast Want even bigger JBL Pro Sound? Pair two GO 4's for stereo sound, or wirelessly connect multiple JBL Auracast-enabled speakers using Auracast for even bigger sound.