1.[Easy to carry] This mini portable speaker measures 4.32.82 inches and is lightweight, so you can easily take it from the party to the park, from your own backyard to the mountains. Due to its mini size, it can be carried in a bag and put in your pocket. You can easily enjoy music no matter where you go and what you do. 2.[Strong compatibility] The Bluetooth 5.0 solution provides more efficient and stable wireless transmission, has strong anti-interference capabilities, and is compatible with Android and IOS devices. You can go on a long bike ride, watch TV shows and streaming movies for hours, or finish an audiobook while working from home - all wirelessly and without interruption. The Retro Bluetooth Speaker also supports TF cards and USB disks. 3.[Good sound quality] The Retro Bluetooth Speaker dual drivers produce a huge 4.5W stereo sound, trying to guide you into a more active and productive world of music. The digital signal processor with dynamic range control ensures that high volumes are not distorted, and low volumes produce full bass. 4.【Long battery life】This mini Bluetooth speaker has a super long playback time, it can play 4-5 hours of music on a single charge, built-in 400mAh rechargeable lithium battery, standby time is more than 72 hours. Even if there is no power outlet nearby, you can still use a mobile power bank to charge the device. Therefore, the HM-11 small Bluetooth speaker will bring you a long-lasting and worry-free music journey.