EXCELLENT SOUND QUALITY: The bluetooth speaker uses two high-performance speakers and an impact bass radiator, which can output a total of 30W of 360 ° immersive sound. The upgraded subwoofer can deliver rich and clear sound without distortion. .12-Hour Continuous Playback Time: 12 hours of continuous playback after class at medium volume, which is longer than ordinary wireless outdoor speakers. Note: The playing time varies depending on the volume.Professional IPX7 Waterproof: This waterproof bluetooth speaker is suitable for all outdoor activities, rain, dust, snow, water, sand, and can be submerged in water for a short time. You can take the waterproof bluetooth speaker with you and enjoy it in the shower, swimming and on the beach.Free Volume Adjustment: The portable bluetooth speaker is equipped with a button, and the volume can be adjusted at will, which is simple and convenient.