40mm USB 2.1 audio Speaker D0380 1. 3D sound technology with 2.0 channel ... , rich, wide 40mm USB 2.1 audio Speaker D0380 Low frequency sound have power, feel warmly Audio signal cable connect to PC, notebook ... , DVD player, cellphone, MP3 player etc audio outputUSB cable connect to PC ... 5 V or USB 5 V 40mm USB 2.1 audio Speaker D0380