This portable Bluetooth speaker has two audio cavities connected by silicone tape with built-in LED lights at both ends. It can emit different colors of light and be used in different scenarios. When you ride a bicycle at night, you can use the speaker as a bicycle light. When you play outdoors, you can hang the speaker on your bag or tent and brunch. Because it has magnets on the back it's easy to hang in different places. Being waterproof, it is also suitable for use in various outdoor environments.