Sub Device A :

Support 16 languages simultneously

Structure using 15° bevel design ,1.5inches wide viewing angle IOS screen,sutomatic brightness adjustment,offer visitors the best viewing angle effect

Full waterproof design and stainaless steel screw,suitable for outdoor bus installation   

Lossless dt transmission technology,near-CD quality stereo music

Easy to install,little damage to the seat.(only a 20mm hole and four 2.5mm hole is enough)

Using high-quality hedphones,plug number up to 50 million time

Changeable covers,simple shell replacement,easy to operate(only need screwdriver)