*Support 8 kinds of (stereo) or 16 kinds of (mono) languages play at the same time. *Structure using 15¡ã bevel design ,1.5 inches wide viewing angle IPS screen,automatic brightness adjustment,offers visitors the best viewing angle effect. *Full waterproof design and stainless steel screw,Suitable for outdoor bus installation. *Loaaless data transmission technology,near-CD quality stereo music. *Easy to install,little damage to the seat.(Only a 20mm hole and four 2.5-mm hole is enough) *Using high-quality headphones,plug number up to 50 million times. *Changeable covers,simple shell replacement,easy to operate(only need screwdriver).