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.