Bludio T3 Turbine's Built-in Al-Tialloy Battery Zn alloy frame and body ensures it sturdy enough to be unbreakable and durable. Great sound The sound becomes more dynamic, swift and fierce, also with 3D sound effect. Long-wearing The soft and ventilated protein makes you feel comfortable. Line-in and line-out playback With the 3.5mm audio cable, you can share your favorite music with your friends with the line-in/ out. Foldable design The foldable design makes it very convenient and portable.