5X(Operating instructions: 43131 with multi-function buttons.< />For Android: Press once [single click] to switch , [double click or three clicks] previous or song< />For : You can pause the playback. The green light is on. When playing a concert in D format, the light turns blue< />< />Key function operation instructions:< />Press 1: pause< />Press 2: song< />Press 3: Previous song< />Material:Alloy shell + plastic< />colour:< />< />Package Conten:< />1 x Host< />1 x Adapter Cable< />1 x USB Adapter)