1. [IPX7 Waterproof] The speaker is IPX7 waterproof. With IPX7 protection level, this speaker is suitable for you and the outside. It can be used in rainy days or wet rooms, such as in bathrooms, shower rooms, swimming pools, beaches, etc., or it can be immersed in water (less than half an hour). 2. [With and hook] The speaker is equipped with a movable , which can be easily and safely installed on the bicycle. You can use the provided hook to the speaker on the backpack. Very comfortable to wear, very suitable for outdoor activities, biking, hiking, climbing, camping, etc. 3.[BLUETOOTH 5.0]Bluetooth 5.0 version can realize fast and stable connection. It can support stable connections within a working range of 10-15 meters. Enjoy the music without interruption. 4. [10H long running time] Built-in 750mAh battery, after 2.5 hours of charging, you can enjoy 10 hours of uninterrupted music playback at 60% volume. Made of sturdy, high-quality materials, you can enjoy strong and excellent stereo. 5. [Built-in microphone] speaker has hands-free function. Not only can you listen to music or podcasts while driving, you can also chat with the built-in microphone colour: black Material: ABS+PU Package contents: 1*speaker 1* 1*charging cable 1*audio cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.